Crossword Genius

Usual guy (4)

Ross

I believe the answer is:

norm

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

This might be a double definition.

'usual' is the first definition.
(thesaurus)

'guy' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

Can you help me to learn more?

(Other definitions for norm that I've seen before include "expected thing" , "Standard regarded as typical" , "Small boy" , "Standard, criterion" , "Bacterium, virus, etc" .)

I've seen this clue in The Mirror.
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