Able to do splits, say (5)
I believe the answer is:
agile
'able to do splits say' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agile that I've seen before include "Spry - energetic" , "Quick-moving, supple" , "Nimble, fleet" , "Nimble, spry" , "Moving quickly and easily" .)