Cold, cold incline (5)
I believe the answer is:
chill
'cold' is the definition.
(chill can mean cold)
'cold incline' is the wordplay.
'cold' becomes 'C' (eg on taps).
'incline' becomes 'hill' (inclined land).
'c'+'hill'='CHILL'
(Other definitions for chill that I've seen before include "Refrigerate" , "Cool, coolness" , "Make cold (or frightened)" , "Unpleasent coldness in the air" , "Slang injunction to relax - it's cold" .)