Doctor in real organised walk (6)
I believe the answer is:
ramble
'walk' is the definition.
(I know that ramble is a type of amble)
'doctor in real organised' is the wordplay.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'in' indicates putting letters inside.
'organised' indicates an anagram.
'real' anagrammed gives 'rale'.
'mb' inserted into 'rale' is 'RAMBLE'.
(Other definitions for ramble that I've seen before include "Walk as leisure activity" , "Show incoherence" , "Leisurely walk" , "Wander where you please" , "Walk for pleasure or talk confusingly" .)