Just the ordinary little man (4)

I believe the answer is:

norm

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

'just the ordinary' is the definition.
I can't judge whether this definition defines the answer.

'little man' is the wordplay.
'little' becomes 'nor' (I can't justify this - if you can you should give a lot more credence to this answer).
'man' becomes 'm'.
'nor'+'m'='NORM'

Can you help me to learn more?

(Other definitions for norm that I've seen before include "Standard, average" , "Standard level of performance" , "Rule; average" , "Drawing stick" , "Standard, criterion" .)

I've seen this clue in the Evening Standard.

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