Crossword Genius

Elm is so amazingly flexible (7)

Ross

I believe the answer is:

lissome

'flexible' is the definition.
(I've seen this before)

'elm is so amazingly' is the wordplay.
'amazingly' indicates anagramming the letters.
'elm'+'is'+'so'='elmisso'
'elmisso' anagrammed gives 'LISSOME'.

(Other definitions for lissome that I've seen before include "Moving supply" , "pliable" , "So smile, being agile and lithe" , "Slim, supple, graceful" , "Thin - supple - graceful" .)

I've seen this clue in The Sun.
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