Poem daughter's seen in Old English (3)
I believe the answer is:
ode
'poem' is the definition.
(ode is a kind of poem)
'daughter's seen in old english' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'seen in' is an insertion indicator.
'old english' becomes 'oe'.
'd' inserted within 'oe' is 'ODE'.
(Other definitions for ode that I've seen before include "- - to a 12 Urn" , "Lines" , "poetry" , "Poetic composition" , "Lyric poem" .)