Generous fellow's after stylish flat? Not quite (9)
I believe the answer is:
indulgent
'generous' is the definition.
(thesaurus)
'fellow's after stylish flat? not quite' is the wordplay.
I cannot quite see how this works, but
'stylish' could be 'in' and 'in' is present in the answer.
'not' could be 'nt' (synonyms) and 'nt' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for indulgent that I've seen before include "Too tolerant or generous" , "passing over faults" , "Ready to excuse faults" , "Ready to overlook faults" , "Tolerant, lenient" .)