Nowadays, riot management is skilful (6)
I believe the answer is:
adroit
'is skilful' is the definition.
(adroit can mean skilful or masterful)
'nowadays riot management' is the wordplay.
'nowadays' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'management' indicates an anagram.
'riot' anagrammed gives 'roit'.
'ad'+'roit'='ADROIT'
(Other definitions for adroit that I've seen before include "Quick or skilful" , "resourceful" , "Deft and skilful" , "Apt" , "Dextrous" .)