Song composed to capture a daughter (8)
I believe the answer is:
serenade
'song' is the definition.
(serenade is a kind of song)
'composed to capture a daughter' is the wordplay.
'composed' becomes 'serene' (I've seen this in other clues).
'to capture' is an insertion indicator.
'daughter' becomes 'd' (genealogical abbreviation).
'a'+'d'='ad'
'serene' placed around 'ad' is 'SERENADE'.
(Other definitions for serenade that I've seen before include "composition" , "Evening love song" , "Murder" , "Musical piece" , "Song sung by suitor" .)