Set of bars that irritate (7)

I believe the answer is:

grating

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'bars that irritate' is the definition.
'grating' can be an answer for 'bars' (I've seen this before). I am not sure about the rest of the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for grating that I've seen before include "Rasping - grille" , "Unpleasantly harsh in sound" , "Wearing away" , "Ring tag (anag.)" , "Lattice" .)

I've seen this clue in The Irish Independent.

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