Crossword Genius

Commonplace freedom a factory owner enjoys (3-2-3-4)

Ross

I believe the answer is:

run-of-the-mill

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

'commonplace' is the definition.
(thesaurus)

'freedom a factory owner enjoys' is the wordplay.
I cannot really understand how this works, but
'freedom' could be 'run' (I have seen 'freedom of access' mean 'run' so perhaps 'freedom' could also mean 'run') and 'run' is located in the answer.
'factory' could be 'mill' (mill is a type of factory) and 'mill' is present in the answer.
The remaining letters 'ofthe' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for run-of-the-mill that I've seen before include "Mediocre" , "Ordinary" , "Bog standard" , "Unexceptional" , "Everyday" .)

I've seen this clue in The Sunday Times.
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