Exhaust Spooner's dim individual (8)
I believe the answer is:
tailpipe
'exhaust' is the definition.
(I know that exhaust can be written as tailpipe)
'spooner's dim individual' is the wordplay.
I cannot quite understand how this works, but
'individual' could be 'tail' (tail is a kind of individual) and 'tail' is present in the answer.
The remaining letters 'pipe' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for tailpipe that I've seen before include "End to an exhaust system" , "Car exhaust (US)" , "Rear section of exhaust" .)