Measure of malts in Glenfiddich? (6)
I believe the answer is:
single
'measure' is the definition.
(single is a kind of measure)
'of malts in glenfiddich?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'SINGLE' is hidden in the letters of 'malts in glenfiddich'.
(Other definitions for single that I've seen before include "Short pop record" , "Just one, or unmarried" , "Unattached" , "Only one; record" , "one > individual" .)