Ring tree to express a view? (5)
I believe the answer is:
opine
'express a view?' is the definition.
(I've seen this in another clue)
'ring tree' is the wordplay.
'ring' becomes 'o' (letter resembling a ring).
'tree' becomes 'pine' (pine is a kind of tree).
'o'+'pine'='OPINE'
'to' is the link.
(Other definitions for opine that I've seen before include "Suppose" , "Express or hold view" , "judge" , "Conjecture" , "Say what one thinks" .)