Crossword Genius

Bars that irritate? (7)

Ross

I believe the answer is:

grating

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

I don't understand how the rest of the clue works.

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(Other definitions for grating that I've seen before include "Unpleasantly harsh in sound" , "Frame of iron bars to block passage but allow air" , "Ring tag (anag.)" , "Wearing away" , "Rasping - grille" .)

I've seen this clue in The Irish Independent.
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