No new sort of calendar girl (5)
I believe the answer is:
julia
'girl' is the definition.
'no new sort of calendar' is the wordplay.
'no' is a deletion indicator.
'new' becomes 'n'.
'sort of calendar' becomes 'julian'.
'julian' with 'n' taken away is 'JULIA'.
(Other definitions for julia that I've seen before include "- - Roberts, star" , "Girl" , "-- Roberts, US actress" , "___ Roberts, actor" .)