Teacher in rush changed tune? (10)
I believe the answer is:
remastered
'changed tune?' is the definition.
(as in remastering a musical recording)
'teacher in rush' is the wordplay.
'teacher' becomes 'master' (I've seen this before).
'in' is an insertion indicator.
'rush' becomes 'reed' (I've seen this before).
'master' going within 'reed' is 'REMASTERED'.
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