Recalled primitive weapon being used with drug business (5)
I believe the answer is:
trade
'business' is the definition.
(trade is a kind of business)
'recalled primitive weapon being used with drug' is the wordplay.
'recalled' says the letters should be written backwards.
'primitive weapon' becomes 'd'art' (I've seen this in another clue).
'being used with' is a charade indicator (letters next to each other).
'drug' becomes 'e' (E is another name for ecstasy).
'dart' in reverse letter order is 'trad'.
'trad'+'e'='TRADE'
(Other definitions for trade that I've seen before include "Barter or swap" , "Business - deal" , "Rated (anag.)" , "Commerce - traffic" , "Give and receive (blows)" .)