Father and daughter kept in trim (5)
I believe the answer is:
padre
'father' is the definition.
(synonyms)
'daughter kept in trim' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'kept in' indicates putting letters inside.
'trim' becomes 'pare' (synonyms).
'd' put into 'pare' is 'PADRE'.
'and' acts as a link.
(Other definitions for padre that I've seen before include "non-combatant officer" , "Father" , "clerical worker" , "Army serviceman?" , "Priest, chaplain" .)