Occasionally trail going back and forth at exhibition venue might cause annoyance (8)

I believe the answer is:

irritate

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

I don't understand the remainder of the clue.

(Other definitions for irritate that I've seen before include "Make angry or fretful" , "Vex, aggravate" , "Anger, annoy" , "Provoke" , "Annoy or cause itching" .)

I've seen this clue in The Irish Times.

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