The high road is my comfort zone (8)
I believe the answer is:
corniche
'the high road' is the definition.
(a corniche is a road on a cliff)
'my comfort zone' is the wordplay.
'my' becomes 'cor' (both are expressions of surprise).
'comfort zone' becomes 'niche' (a niche is a specialised place or position).
'cor'+'niche'='CORNICHE'
'is' is the link.
(Other definitions for corniche that I've seen before include "coast road by a cliff face" , "Cliff-side road" , "Roller" , "cliff route" , "way along cliff edge" .)