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Upset PA sees head of team leaving (5)

Ross

I believe the answer is:

annoy

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'upset' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for annoy that I've seen before include "trouble" , "Irk" , "hack off" , "Make slightly angry" , "Upset" .)

I've seen this clue in The Times.
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