Talent that's good for British briskness (7)
I believe the answer is:
agility
'briskness' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for agility that I've seen before include "Sprightliness" , "dexterity" , "The ability to move quickly and easily" , "Gracefulness of the quick and nimble" , "Gaily it goes with nimble movement" .)