Moving easily, finally fulfil one’s part (7)

I believe the answer is:

lissome

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'moving easily finally fulfil one's part' is the definition.
I can't judge whether this defines the answer.

'finally fulfil one's part' is the wordplay.
'finally' indicates one should take the final letters.
'one's' becomes 'i's' (Roman numeral).
'part' becomes 'some' (I've seen this before).
The last letter of 'fulfil' is 'l'.
'l'+'is'+'some'='LISSOME'

Can you help me to learn more?

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

I've seen this clue in The Times.

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