Small harpsichord (6)
I believe the answer is:
spinet
'small harpsichord' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spinet that I've seen before include "A small harpsichord of old" , "Instrument resembling a small harpsichord" , "organ" , "Instep (anag)" , "Step in with old musical instrument" .)