Call out cancelled after study (4,3)

I believe the answer is:

read off

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'call' is the definition.
I know nothing about this answer so I can't tell whether this works.

'cancelled after study' is the wordplay.
'cancelled' becomes 'off' (similar in meaning).
'after' is a charade indicator (letters next to each other).
'study' becomes 'read' (synonyms).
'off' after 'read' is 'READ OFF'.

'out' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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