Take a chance with fish shop (6)
I believe the answer is:
betray
'shop' is the definition.
(thesaurus)
'take a chance with fish' is the wordplay.
'take a chance with' becomes 'bet'.
'fish' becomes 'ray' (ray is a kind of fish**).
'bet'+'ray'='BETRAY'
(Other definitions for betray that I've seen before include "Reveal (intentionally or unintentionally)" , "Deliver to an enemy by treachery" , "Breach the trust of" , "Inadvertently reveal" , "26 [SELL]" .)