Section of coil is somewhat flexible (7)

I believe the answer is:

lissome

'flexible' is the definition.
(thesaurus)

'section of coil is somewhat' is the wordplay.
'section of' indicates a hidden word.
'LISSOME' is hidden within 'coil is somewhat'.

(Other definitions for lissome that I've seen before include "pliable" , "Willowy" , "Lithe; nimble" , "Oil mess (anag)" , "Thin - supple - graceful" .)

I've seen this clue in The Telegraph.

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