11 across
Teacher
prepares
fruit
for
markers
(10)
Teacher prepares fruit for markers (10)
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The definition is at the end of the clue.
How the clue works
Look at markers — that's your definition, meaning gravestones. HEAD gives you teacher (as in a school head), and STONES means prepares fruit, as in stoning cherries or plums by removing the stones. Put them together and you're there.