A month with a girl (7)
I believe the answer is:
augusta
'girl' is the definition.
'a month with a' is the wordplay.
'a month' becomes 'August' (August is an example).
'with' says to put letters next to each other.
'august'+'a'='AUGUSTA'
(Other definitions for augusta that I've seen before include "Lady Bracknell" , "Masters course" , "Graham Greene's travelling aunt" , "Female name; capital of state of Maine" , "22 [MAINE] 's capital" .)