Following onset of rioting, I check bolt (5)
I believe the answer is:
rivet
'bolt' is the definition.
(thesaurus)
'following onset of rioting i check' is the wordplay.
'following' means one lot of letters go next to another.
'onset of' says to take the initial letters.
'check' becomes 'vet' (I've seen this before**).
The first letter of 'rioting' is 'r'.
'r'+'i' is 'ri'.
'ri'+'vet'='RIVET'
(Other definitions for rivet that I've seen before include "Arrest" , "Metal fastening pin" , "Clinch - bolt" , "join together" , "Fascinate" .)