Doctor drinking whisky in tumbler? (5)
I believe the answer is:
dryer
'tumbler?' is the definition.
(I've seen this before)
'doctor drinking whisky' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'drinking' indicates putting letters inside.
'whisky' becomes 'rye' (rye whisky is a kind of whisky).
'dr' going around 'rye' is 'DRYER'.
'in' is the link.
(Other definitions for dryer that I've seen before include "Laundry machine" , "Moisture-extracting machine" , "Water extractor" , "could blow your head!" , "tumbler, perhaps" .)