Doctor cared to get drunk in procession (9)
I believe the answer is:
motorcade
'procession' is the definition.
(I know that motorcade is a type of procession)
'doctor cared to get drunk' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'get drunk' is an anagram indicator.
'cared'+'to'='caredto'
'caredto' with letters rearranged gives 'torcade'.
'mo'+'torcade'='MOTORCADE'
'in' acts as a link.
(Other definitions for motorcade that I've seen before include "Procession of people in cars" , "Maybe Kennedy's entourage" , "Moving display" , "Procession of cars bringing VIP" , "vehicles in procession" .)