Average time calculated (5)
I believe the answer is:
meant
'calculated' is the definition.
(thesaurus)
'average time' is the wordplay.
'average' becomes 'mean' (type of average).
'time' becomes 't' (abbreviation).
'mean'+'t'='MEANT'
(Other definitions for meant that I've seen before include "intimated" , "designed" , "Intentional" , "Signified" , "Had as intention or purpose" .)