A sample of very exclusive whisky
I believe the answer is:
rye
'whisky' is the definition.
(I know that rye is a type of whisky)
'a sample of very exclusive' is the wordplay.
'a sample of' says the answer is hidden in the clue (an extract or sample of the clue).
'RYE' is hidden within 'very exclusive'.
(Other definitions for rye that I've seen before include "Gypsy gentleman" , "E. Sussex town; cereal" , "place in East Sussex" , "Hardy annual cereal grass" , "Grain - whiskey - port" .)