Calendar girl can come back (7)
I believe the answer is:
almanac
'calendar' is the definition.
(I've seen this before)
'girl can come back' is the wordplay.
'girl' becomes 'alma' (girl's name).
'come back' shows that the letters should be reversed in order.
'can' in reverse letter order is 'nac'.
'alma'+'nac'='ALMANAC'
(Other definitions for almanac that I've seen before include "Annual calendar or handbook" , "Annual containing information, Old Moore's say" , "Annual list of dates" , "Kind of year-book like Old Moore's" , "Annual publication giving dates of astronomical and other events" .)