City proposal a man casually trimmed (9)
I believe the answer is:
salamanca
'city' is the definition.
(I have seen 'Spanish city ' mean 'salamanca' so perhaps 'city' could also mean 'salamanca')
'proposal a man casually trimmed' is the wordplay.
'trimmed' says the answer is hidden in the clue (part of the clue must be trimmed away).
'SALAMANCA' can be found hidden inside 'proposal a man casually'.
(Other definitions for salamanca that I've seen before include "Spanish city" , "City of western Spain" .)