Loyal Irishman in charge restricting disorder (9)
I believe the answer is:
patriotic
'loyal' is the definition.
('patriotic' can be a synonym of 'loyal')
'irishman in charge restricting disorder' is the wordplay.
'irishman' becomes 'pat'.
'in charge' becomes 'ic'.
'restricting' is an insertion indicator.
'disorder' becomes 'riot' (riot is a kind of disorder**).
'pat'+'ic'='patic'
'patic' placed around 'riot' is 'PATRIOTIC'.
(Other definitions for patriotic that I've seen before include "flag-waving?" , "Supporting the state" , "Loyal" , "Devoted to one's country" , "Having love for one's country" .)