Hunt lacks a shape (5)
I believe the answer is:
forge
'shape' is the definition.
(synonyms)
'hunt lacks a' is the wordplay.
'hunt' becomes 'forage' (foraging is a kind of hunting).
'lacks' is a deletion indicator.
'forage' with 'a' taken away is 'FORGE'.
(Other definitions for forge that I've seen before include "Blacksmith's workshop" , "Create; counterfeit" , "Shape by heating and hammering, as smith does" , "Blacksmith's premises" , "Smith's workplace" .)