Sisters finding some men unsatisfactory (4)
I believe the answer is:
nuns
'sisters' is the definition.
(I've seen this before)
'some men unsatisfactory' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'NUNS' is hidden in the letters of 'men unsatisfactory'.
'finding' is the link.
(Other definitions for nuns that I've seen before include "Retired women" , "Sisters in order" , "Religious sisters" , "Convent residents" , "Women in religious vocations" .)