Pass over part of meal — it’s not very warm (7)
I believe the answer is:
coldish
'not very warm' is the definition.
(I've seen this before)
'pass over part of meal' is the wordplay.
'pass' becomes 'col' (col is a kind of pass).
'over' means one lot of letters go next to another.
'part of meal' becomes 'dish' ('dish' is part of 'meal').
'col'+'dish'='COLDISH'
'it's' acts as a link.
(Other definitions for coldish that I've seen before include "not very warm" , "wintry weather like this" .)