Gymnast's need (7)
I believe the answer is:
agility
'gymnast's need' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agility that I've seen before include "Gracefulness of the quick and nimble" , "Litheness" , "Gaily it goes with nimble movement" , "Spryness" , "dexterity" .)