Front removed from toy gun (5)
I believe the answer is:
rifle
'gun' is the definition.
(I know that Rifle is a type of piece)
'front removed from toy' is the wordplay.
'front removed from' means to remove the first letter.
'toy' becomes 'trifle' (both can mean to play with).
'trifle' with its initial letter taken off is 'RIFLE'.
(Other definitions for rifle that I've seen before include "Lifer (anag.)" , "Gun; thoroughly search" , "Rummage" , "Gun; plunder" , "Shoulder firearm" .)