Small high-pitched flute (4)
I believe the answer is:
fife
'small high-pitched flute' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fife that I've seen before include "Historic Scottish county (and kingdom)" , "Small flute - ancient kingdom of central Scotland" , "Small flute, goes with drum" , "Historical Scottish county - wind instrument" , "somewhere in Scotland" .)