Again call on girl during fresh exam (7)
I believe the answer is:
revisit
'again call on' is the definition.
('visit' can be a synonym for 'call on' so perhaps 'revisit' is OK for 'again call on')
'girl during fresh exam' is the wordplay.
'girl' becomes 'vi' (short for Violet).
'during' means one lot of letters goes inside another.
'fresh exam' becomes 'resit' (sitting an exam again).
'vi' going inside 'resit' is 'REVISIT'.
(Other definitions for revisit that I've seen before include "Reconsider" , "coming to call back?" , "Go back to (place)" , "Consider again" , "comeback?" .)