Crossword Genius

Held good girl in school (7)

Ross

I believe the answer is:

cohered

'held good' is the definition.
(cohere can mean to stick together or hold good)

'girl in school' is the wordplay.
'girl' becomes 'her'.
'in' indicates putting letters inside.
'school' becomes 'coed' (I've seen this before).
'her' going inside 'coed' is 'COHERED'.

I've seen this clue in The Times.
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