Spoke, being agile (4)
I believe the answer is:
spry
'agile' is the definition.
(synonyms)
I can't explain the remainder of the clue.
(Other definitions for spry that I've seen before include "'Agile, nimble (4)'" , "Moving quickly and lightly" , "Still able to move lightly and fast" , "Sprightly" , "Fleet" .)