Crossword Genius

Past master? (7,7)

Ross

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9 13

7,7

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'past master?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'past master?' is the wordplay.
'past' becomes 'history' (history is a kind of past).
'master?' becomes 'teacher' (I've seen this before).
'history'+'teacher'='HISTORY TEACHER'

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I've seen this clue in The Hindu.
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