Long-armed ape (9)

I think it could be either:

Which length description are you looking for?:

gibbon

'long-armed ape' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for gibbon that I've seen before include "A historian; SE Asian forest creature" , "an eighteenth-century author" , "Large tailless ape" , "Small ape - famous historian" , "Member of the ape family" .)

I've seen this clue in The Sun.

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