Change of address brings doctor victory (4)
I believe the answer is:
move
'change of address' is the definition.
'doctor victory' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'victory' becomes 'VE' (VE is short for Victory in Europe).
'mo'+'ve'='MOVE'
'brings' acts as a link.
(Other definitions for move that I've seen before include "change position on board" , "Proceed" , "Travel - propose" , "Change residence; propose formally" , "Change location" .)