Lively, nimble (4)
I believe the answer is:
spry
This clue is a double definition.
'lively' is the first definition.
(I've seen this in another clue)
'nimble' is the second definition.
(I know that nimble can be written as spry)
(Other definitions for spry that I've seen before include "Far from doddering" , "Nimble (for one's age?)" , "Quick and agile" , "(Of an old person) lively" , "Sprightly" .)