Crossword Genius

Bother edging tomb mostly with quartz (9)

Ross

I believe the answer is:

aggravate

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'bother' is the definition.
(thesaurus)

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

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(Other definitions for aggravate that I've seen before include "Pester" , "Make more serious" , "compound" , "Worsen" , "Make (a problem) worse" .)

I've seen this clue in The Independent.
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