Feature of poetry by Yeats, perhaps or Frost, reportedly (5)
I believe the answer is:
rhyme
'feature of poetry by yeats perhaps' is the definition.
I can't judge whether this definition defines the answer.
'frost reportedly' is the wordplay.
'frost' becomes 'rime' (rime is frost formed by freezing water vapour).
'reportedly' shows a homophone (sound like).
'rime' sounds like 'RHYME'.
'or' is the link.
Can you help me to learn more?
(Other definitions for rhyme that I've seen before include "Without reason or . . . . . - makes no sense" , "Word for bird" , "'Moon' and 'June' do" , "Nursery verse?" , "Poe's was sort of Runic" .)