Percussion instrument played in pairs (6)
I believe the answer is:
maraca
'percussion instrument played in pairs' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for maraca that I've seen before include "'Hand-held percussion instrument, hand-held (6)'" , "Percussion instrument played in pairs" , "One of a pair of hollow pieces of wood or bone for Spanish dancing" , "One of a pair used by Spanish dancer" , "one easily rattled?" .)