Ordered select Eastern instrument (7)
I believe the answer is:
celeste
'instrument' is the definition.
(I've seen this before)
'ordered select eastern' is the wordplay.
'ordered' indicates an anagram.
'eastern' becomes 'e'.
'select' is an anagram of 'celest'.
'celest'+'e'='CELESTE'
(Other definitions for celeste that I've seen before include "Keyboard instrument" , "The Mary - - (ghost ship)" , "Marie -, ill-fated ship" .)