Bother edging tomb mostly with quartz (9)
I believe the answer is:
aggravate
'bother' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for aggravate that I've seen before include "Pester" , "Make more serious" , "compound" , "Worsen" , "Make (a problem) worse" .)