Divine kind of wine consumed by ancient Briton (7)
I believe the answer is:
predict
'divine' is the definition.
(thesaurus)
'kind of wine consumed by ancient briton' is the wordplay.
'kind of wine' becomes 'red'.
'consumed by' is an insertion indicator.
'ancient briton' becomes 'pict' (I've seen this before).
'red' put within 'pict' is 'PREDICT'.
(Other definitions for predict that I've seen before include "Guess (the future)" , "Forecast" , "act as oracle" , "Prophesy - portend" , "Foresee" .)