A doctor went ahead and walked (6)
I believe the answer is:
ambled
'walked' is the definition.
(ambling is a kind of walking)
'a doctor went ahead' is the wordplay.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'went ahead' becomes 'led' (led the way).
'a'+'mb'+'led'='AMBLED'
'and' acts as a link.
(Other definitions for ambled that I've seen before include "Walked lazily along - so blamed" , "Blamed (anag.)" , "Wandered about aimlessly" , "Walked slowly - blamed for it" , "Sauntered" .)