A fine feminine capacity for kindliness? (10)
I believe the answer is:
affability
'kindliness?' is the definition.
'a fine feminine capacity' is the wordplay.
'a fine' becomes 'af' (I've seen this in other clues).
'feminine' becomes 'f' (abbreviation listed in Chambers).
'capacity' becomes 'ability' (I've seen this before).
'af'+'f'+'ability'='AFFABILITY'
'for' is the link.
(Other definitions for affability that I've seen before include "Good nature, sociability" , "good humour" .)