The pound is a bit flexible (7)

I believe the answer is:

lissome

'flexible' is the definition.
(thesaurus)

'the pound is a bit' is the wordplay.
'the pound' becomes 'l'.
'a bit' becomes 'some' (I've seen this in other clues).
'l'+'is'+'some'='LISSOME'

(Other definitions for lissome that I've seen before include "Slim, supple, graceful" , "Thin - supple - graceful" , "Moving supply" , "flexible" , "Lithe; nimble" .)

I've seen this clue in The Telegraph.

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