Verse of Frost heard? (5)
I believe the answer is:
rhyme
'verse' is the definition.
(synonyms)
'frost heard?' is the wordplay.
'frost' becomes 'rime' (rime is frost by freezing water vapour).
'heard?' shows a homophone (sound like).
'rime' is a homophone of 'RHYME'.
'of' is the link.
(Other definitions for rhyme that I've seen before include "Similarity of word-sounds" , "word pattern" , "Correspondence in word sounds" , "Correspondence in the sounds of two or more lines" , "Correspond in sound" .)