Big man catapulted to fame (7)
I believe the answer is:
goliath
'big man' is the definition.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for goliath that I've seen before include "David laid him low with slingshot" , "Biblical giant" , "Giant, David's victim" , "Giant Philistine flattened by David" , "I got Hal a giant form the bible" .)