15 across
Poke
with
end
of
sharp
stick
(4)
Poke with end of sharp stick (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Poke, giving you PROD. For the wordplay, take the last letter of "sharP" (that's your "end of sharp") and stick it in front of stick (ROD), and there's your answer.