First drop of sherry, enough to taste (6)
I believe the answer is:
sample
'taste' is the definition.
('sample' can be a synonym of 'taste')
'first drop of sherry enough' is the wordplay.
'first drop of' suggests taking the first letters.
'enough' becomes 'ample' (I've seen this before).
The initial letter of 'sherry' is 's'.
's'+'ample'='SAMPLE'
'to' is the link.
(Other definitions for sample that I've seen before include "Taste; specimen" , "Small representative piece" , "Cross section" , "Experience" , "Small part representing the whole" .)