Confusion reported in age (4)
I believe the answer is:
days
'age' is the definition.
(thesaurus)
'confusion reported' is the wordplay.
'confusion' becomes 'daze' (daze is a kind of confusion).
'reported' indicates a 'sounds like' (homophone) clue.
'daze' is a homophone of 'DAYS'.
'in' is the link.
(Other definitions for days that I've seen before include "See 1 down" , "Periods (of week)" , "24-hour periods" , "` `They are not long, the .... of wine and roses' ' (Dowson)" , "Sevenths of a week" .)