CD error when mixed suppresses eastern instrument (8)
I believe the answer is:
recorder
'instrument' is the definition.
(recorder is a kind of instrument)
'cd error when mixed suppresses eastern' is the wordplay.
'when mixed' indicates an anagram.
'suppresses' is an insertion indicator.
'eastern' becomes 'e'.
'cd'+'error'='cderror'
'cderror' is an anagram of 'recordr'.
'recordr' placed around 'e' is 'RECORDER'.
(Other definitions for recorder that I've seen before include "Instrument of the flute family" , "Legal officer - wind instrument" , "Registrar" , "Wind instrument - instrument for transferring sound to tape" , "Archivist - part-time judge" .)