What's in title of poem by Coleridge or Frost (4)
I believe the answer is:
rime
I believe this is a double definition.
'what's in title of poem by coleridge' is the first definition.
(reference to The Rime of the Ancient Mariner)
'frost' is the second definition.
('rime' can be a synonym of 'frost')
'or' is the link.
(Other definitions for rime that I've seen before include "Ice" , "''The ... of the Ancient Mariner'' (Coleridge)" , "dated poetry" , "Kind of frost in mire" , "Hoar frost" .)