10 across
Set
of
wooden
bars
cut
between
axes
and
whetstone
(9)
Set of wooden bars cut between axes and whetstone (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is set of wooden bars — your percussion instrument. For the wordplay, take XY (the axes on a graph) and HONE (a whetstone), then slot LOP (meaning "cut") in between the two, giving you XY, then LOP, then HONE.