Usual guy (4)
I believe the answer is:
norm
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" .)