Basque ball game (6)
I believe the answer is:
pelota
'basque ball game' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pelota that I've seen before include "SPORT/GAME" , "Basque ball-game" , "Spanish game at Opel" , "Basque sport" , "Spanish game played with a ball and wickerwork racket" .)