Spin doctor back in a seedy bar... (5)
I believe the answer is:
drive
'spin' is the definition.
(I've seen this in another clue)
'doctor back in a seedy bar' is the wordplay.
'back' indicates one should take the final letters.
'in' is an insertion indicator.
'a seedy bar' becomes 'dive' (as in a dive bar).
The final letter of 'doctor' is 'r'.
'r' inserted inside 'dive' is 'DRIVE'.
(Other definitions for drive that I've seen before include "Steer; trip" , "Go by car" , "Avenue" , "gear" , "Use Aston Martin, say" .)