Walk like a doctor in drink? (5)
I believe the answer is:
amble
'walk' is the definition.
(I know that amble is a type of walk)
'doctor in drink?' is the wordplay.
'doctor' becomes 'MB' (Bachelor of Medicine, Medicinae Baccalaureus).
'in' is an insertion indicator.
'drink?' becomes 'ale' (type of beer).
'mb' inserted into 'ale' is 'AMBLE'.
'like a' acts as a link.
(Other definitions for amble that I've seen before include "Toddler does this" , "Casual walk" , "Wander gently along" , "Blame (anag.)" , "Make slow progress" .)