Chaperone expected girl back (6)
I believe the answer is:
duenna
'chaperone' is the definition.
(duenna is a kind of chaperone)
'expected girl back' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'girl' becomes 'ann' (woman's name).
'back' shows that the letters should be reversed in order.
'ann' written backwards gives 'nna'.
'due'+'nna'='DUENNA'
(Other definitions for duenna that I've seen before include "Spanish chaperon or governess" , "Chaperone in Madrid" , "governess in Spain" , "Governess, chaperone" , "Female companion[" .)