Average temperature implied (5)
I believe the answer is:
meant
'implied' is the definition.
(imply can mean to mean something)
'average temperature' is the wordplay.
'average' becomes 'mean' (type of average).
'temperature' becomes 't' (abbreviation).
'mean'+'t'='MEANT'
(Other definitions for meant that I've seen before include "Had as purpose or design" , "planned" , "Aimed" , "proposed" , "Denoted" .)