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A French stall, rickety (8)

Ross

I believe the answer is:

unstable

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'rickety' is the definition.
(similar in meaning)

'a french stall' is the wordplay.
'a french' becomes 'un' ('a' in French).
'stall' becomes 'stable' (I can't justify this - if you can you should give a lot more credence to this answer).
'un'+'stable'='UNSTABLE'

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(Other definitions for unstable that I've seen before include "Not well-balanced, liable to wobble" , "Likely to collapse" , "Precarious or subject to change" , "Not mentally sound" , "Wobbly" .)

I've seen this clue in The Daily Express.
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