Fussy individuals endlessly admitting faults is healthy (9)
I believe the answer is:
wholesome
'healthy' is the definition.
(associated in meaning)
'fussy individuals endlessly admitting faults' is the wordplay.
'fussy individuals' becomes 'women' (as in 'old woman', derogatory term for a fussy man).
'endlessly' means to remove the last letter.
'admitting' means one lot of letters goes inside another.
'faults' becomes 'holes'.
'women' with its final letter removed is 'wome'.
'wome' placed around 'holes' is 'WHOLESOME'.
'is' acts as a link.
(Other definitions for wholesome that I've seen before include "Good for you!" , "Respectable" , "Previously propitious" , "Beneficial" , "Moral" .)