Walk to have beer with doctor (5)
I believe the answer is:
amble
'walk' is the definition.
(ambling is a kind of walking)
'beer with doctor' is the wordplay.
'beer' becomes 'ale' (type of beer).
'with' is an insertion indicator.
'doctor' becomes 'MB' (Bachelor of Medicine).
'ale' going around 'mb' is 'AMBLE'.
'to have' acts as a link.
(Other definitions for amble that I've seen before include "promenade" , "Go at a leisurely gait" , "Walk at an easy pace" , "Walk in a leisurely way" , "Blame for leisurely walk" .)