Raise weapon to acquire the gold (6)
I believe the answer is:
nugget
'the gold' is the definition.
(thesaurus)
'raise weapon to acquire' is the wordplay.
'raise' shows that the letters should be reversed in order.
'weapon' becomes 'gun' (I've seen this before).
'to acquire' becomes 'get' ('get' can be a synonym of 'acquire').
'gun' in reverse letter order is 'nug'.
'nug'+'get'='NUGGET'
(Other definitions for nugget that I've seen before include "Lump of gold ore" , "Piece of advice" , "Lump (of gold, etc)" , "Piece of precious metal (or chicken?)" , "Small amount" .)