Doctor with a medium drink (4)
I believe the answer is:
dram
'drink' is the definition.
(small alcoholic drink)
'doctor with a medium' is the wordplay.
I cannot quite understand how this works, but
'doctor' could be 'dr' (abbreviation) and 'dr' is present in the answer.
'a' is found in the answer.
'medium' could be 'm' (as in UK clothing sizes) and 'm' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dram that I've seen before include "A wee spirit" , "Wee drop of whisky?" , "Nip, snifter" , "Small drink (Scots)" , "Small drink of scotch" .)