Last of this beer found in market (4)
I believe the answer is:
sale
'market' is the definition.
(thesaurus)
'last of this beer' is the wordplay.
'last of' says to take the final letters.
'beer' becomes 'ale' (I've seen this before**).
The final letter of 'this' is 's'.
's'+'ale'='SALE'
'found in' acts as a link.
(Other definitions for sale that I've seen before include "Disposal - auction" , "Public auction" , "Occasion for buying at reduced prices" , "See 12 Down" , "Disposal of shop's stock at reduced prices" .)