Litheness (7)
I believe the answer is:
agility
'litheness' 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 "Physical ability to move nimbly and quickly" , "Litheness" , "Sprightliness" , "The ability to move quickly and easily" , "Gaily it goes with nimble movement" .)