Opinion on long facial hair (8)
I believe the answer is:
sideburn
'facial hair' is the definition.
(I've seen this before)
'opinion on long' is the wordplay.
'opinion' becomes 'side' (side is a kind of opinion).
'on long' becomes 'burn' (I can't justify this - if you can you should give a lot more credence to this answer).
'side'+'burn'='SIDEBURN'
Can you help me to learn more?
(Other definitions for sideburn that I've seen before include "Body hair" , "Facial hair grown down one side of a man's face" .)