Temporary miss, perhaps (6,7)
I believe the answer is:
supply teacher
'perhaps' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'temporary miss' is the wordplay.
'temporary' becomes 'supply' (I can't justify this - if you can you should believe this answer much more).
'miss' becomes 'teacher' (a female teacher might be addressed 'miss').
'supply'+'teacher'='SUPPLY TEACHER'
Can you help me to learn more?
(Other definitions for supply teacher that I've seen before include "A short-term replacement" , "Stand-in educator" , "Temporary educator" , "Stopgap in school" .)