Wild tiger isn't posing again (9)

I believe the answer is:

resitting

'posing again' is the definition.
('sitting' is a kind of 'posing' so perhaps 'resitting' is OK for 'posing again')

'wild tiger isn't' is the wordplay.
'wild' indicates an anagram.
'tiger'+'isnt'='tigerisnt'
'tigerisnt' anagrammed gives 'RESITTING'.

I've seen this clue in the Sydney Morning Herald.

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