Getting up to dry fish (6)
I believe the answer is:
turbot
'fish' is the definition.
(I know that turbot is a type of fish)
'getting up to dry' is the wordplay.
'getting up' shows that the letters should be reversed in order.
'dry' becomes 'brut' (type of wine).
'to'+'brut'='tobrut'
'tobrut' back-to-front is 'TURBOT'.
(Other definitions for turbot that I've seen before include "Expensive flatfish" , "[SOMETHING FISHY]" , "Type of fish" , "Swimmer" , "Large food fish" .)