Crossword Genius

Possessive person who'll succeed on time (5)

Ross

I believe the answer is:

their

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Here is my best explanation:

'possessive' is the definition.
(I've seen this before)

'person who'll succeed on time' is the wordplay.
'person who'll succeed' becomes 'heir'.
'on' is a charade indicator (letters next to each other).
'time' becomes 't'.
'heir' put after 't' is 'THEIR'.

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This clue was last seen in The Guardian

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