Biblical giant (7)
I believe the answer is:
goliath
'biblical giant' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for goliath that I've seen before include "David slew him with a slingshot (7)" , "Philistine giant slain by David" , "David laid him low with slingshot" , "Giant Philistine felled by David" , "Giant Philistine laid low by David" .)