A month with a girl (7)
I believe the answer is:
'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.
(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" .)