That girl in school is stuck (7)
I believe the answer is:
cohered
'stuck' is the definition.
('cohere' can be a synonym of 'stick')
'that girl in school' is the wordplay.
'that girl' becomes 'her'.
'in' means one lot of letters goes inside another.
'school' becomes 'coed' (I've seen this before).
'her' placed inside 'coed' is 'COHERED'.
'is' is the link.
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