Nimbleness (7)
I believe the answer is:
agility
'nimbleness' is the definition.
(synonyms)
This is all the clue.
(Other definitions for agility that I've seen before include "Spryness" , "Physical nimbleness, easy movement" , "Gracefulness of the quick and nimble" , "Gaily it goes with nimble movement" , "Physical ability to move nimbly and quickly" .)