Philistine giant (7)
I believe the answer is:
goliath
'philistine giant' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for goliath that I've seen before include "Giant, David's victim" , "David slew him with a slingshot (7)" , "Giant David slew" , "I got Hal a giant form the bible" , "Giant Philistine laid low by David" .)