Frost recited — his composition? (5)
I believe the answer is:
rhyme
'his composition?' is the definition.
'rhyme' can be an answer for 'composition?' (rhyme is a kind of composition). I am not sure about the 'his' bit.
'frost recited' is the wordplay.
'frost' becomes 'rime' (rime is a type of frost).
'recited' shows a homophone (sound like).
'rime' sounds like 'RHYME'.
Can you help me to learn more?
(Other definitions for rhyme that I've seen before include "Bit of poetry" , "Correspondence in the sounds of two or more lines" , "Poe's was sort of Runic" , "Short poem" , "A nursery . . . . . is a children's jingle" .)