SAS holding down French collaborator? (8)

I believe the answer is:

saunders

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'french collaborator?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'sas holding down' is the wordplay.
'holding' indicates putting letters inside.
'down' becomes 'under' (under means further down).
'sas' going around 'under' is 'SAUNDERS'.

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I've seen this clue in The Times.

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