They can burst with some nasty results (5)
I believe the answer is:
tyres
'they can burst' is the definition.
The definition suggests an adverb but the answer is not.
'with some nasty results' is the wordplay.
'with' indicates the answer is hidden within the clue.
'TYRES' is hidden within 'some nasty results'.
Can you help me to learn more?
(Other definitions for tyres that I've seen before include "Wheel hoops" , "Rubber wheel covers" , "Wheel coverings" , "rubber rings" .)