Some hide ale, ruining trader (6)
I believe the answer is:
dealer
'trader' is the definition.
('dealer' can be a synonym of 'trader')
'some hide ale ruining' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'DEALER' is hidden within 'hide ale ruining'.
(Other definitions for dealer that I've seen before include "One gives out the cards" , "Person engaged in trading" , "Stockjobber" , "Card distributor" , "who makes first bid" .)