Nominally the person to sort out a riot? (7)

I believe the answer is:

janitor

I'm a little stuck... Click here to teach me more about this clue!

'nominally the person' is the definition.
I can't judge whether this defines the answer.

'sort out a riot?' is the wordplay.
'sort' becomes 'jan' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'out' indicates an anagram.
'riot' is an anagram of 'itor'.
'jan'+'itor'='JANITOR'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for janitor that I've seen before include "(In Scotland) school caretaker" , "Caretaker (mainly US)" , "Person looking after building" , "Caretaker or doorkeeper" , "One employed to clean and maintain a building" .)

I've seen this clue in the Evening Standard.

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