Calendar girl initially nude and clothed (7)
I believe the answer is:
almanac
'calendar' is the definition.
(I've seen this before)
'girl initially nude and clothed' is the wordplay.
'girl' becomes 'alma' ().
'initially' says to take the initial letters.
The initial letters of 'nude and clothed' is 'nac'.
'alma'+'nac'='ALMANAC'
(Other definitions for almanac that I've seen before include "Year book with astronomical events, tides etc" , "Annual publication providing information like Old Moore's" , "Informative calendar" , "Calendar with astronomical data and other information" , "Calendar with detailed information" .)