Material that causes stink if burnt in anger (7)
I believe the answer is:
incense
This clue is a double definition.
'material that causes stink if burnt' is the first definition.
(something which releases a nice smell when burnt)
'anger' is the second definition.
(to incense is make angry)
'in' acts as a link.
(Other definitions for incense that I've seen before include "Perfume; enrage" , "Grains burnt in church etc" , "can cause strong emotion" , "Burning fragrance" , "Greatly anger; perfume" .)