Chaps with daughters in fix (4)
I believe the answer is:
mend
'fix' is the definition.
(synonyms)
'chaps with daughters' is the wordplay.
'chaps' becomes 'men' (chap means a man).
'with' says to put letters next to each other.
'daughters' becomes 'd' (genealogical abbreviation for daughters).
'men'+'d'='MEND'
'in' is the link.
(Other definitions for mend that I've seen before include "Heal" , "Fix, repair" , "'Restore, fix (4)'" , "Put right" , "Return to health; repair" .)