We look up to them when Big Boy starts using irons, leaving small dents (4, 9)

A number of answers in the puzzle below relate to the title, given by the clue above. Good luck!

1    2    3  4    5    6    7    8   
               
9                      10        11 
                 
12        13                14     
             
15        16        17      18       
      19  20     
21    22      23                     
           
24        25  26        27  28    29     
                 
30                  31             
                 
32          33                 

AcrossDown
1 First hit, then shatter, poem (5) 1 Middle East allows reversed iron alloy (5)
4 Angry, proud, and mixed up, I exchange rights and lefts on the recess field (10) 2 Removed impurities from Shark's calling card in the tall grass (7)
9 Gustav's masterpiece in Greece - if felt, owe romans homage (6, 5) 3 Fair and flat (4)
10 A cross in the news resembles lizards (5) 4 Malaysia's famous pair split roses, pear, town, tea (8, 6)
12 Left? Write? What's the connection? (4) 5 English grange as candle center (6)
13 Real prisoner on mediterranean island (8) 6 Horizontal supports started glowing iris red, described every returning steelworker (7)
14 Just one mistake ends coop (3) 7 Less than pounds, it finishes jumping up and down (6)
15 Before Delaware intends to criticize (2, 6) 8 Inside its nest, the ambidextrous yolk wins a big apple holder (3, 4, 2)
17 Question as strikeout? (3) 11 In front of sellers, state more disruption in Cardinal's home (2, 6, 4)
18 Sketch kits in bits (4) 15 Imposing pull, behind emergency room in Germany (8)
21 Place origin after global exchange of Manhattan's twins (with 23 across) (5, 5, 6) 16 Sam Adams lager has crazy inclinations (3)
23 see 21 across 19 I hear about disease and a country in Asia (9)
24 Red Roman with broken oar surrounds Nazi security force (5) 20 Anger a talking horse to become tougher (8)
26 Boats come to this Western half of harbor, ignoring remainder of fleet (5) 22 Buckle up again - relax before finishing trap (7)
28 Pan and slowly fade away (5) 25 Upstairs ocean missing an l (5)
30 Referenda votes against nurses following breakdown on 4/5s of truce (2, 7) 27 20% of a normal whiskey bottle (5)
31 Weapon says to hold firm around the ear (7) 29 Bejeweled headband worn by a sun god after it was returned (5)
32 Room at the baths begins cold and empty (5)  
33 A cart held pieces of a church (9)