French ass isn't holding framework (7)

I believe the answer is:

chassis

'framework' is the definition.
(I know that chassis is a type of container)

'french ass isn't holding' is the wordplay.
'holding' indicates the answer is hidden within the clue.
'CHASSIS' is hidden within 'french ass isnt'.

(Other definitions for chassis that I've seen before include "Vehicle's structural frame" , "Vehicle structure" , "Mounting" , "Undercarriage" , "sash" .)

I've seen this clue in The Times.

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