Crossword Genius

In short, he certainly wasn't well up in Roman history (4)

Ross

I believe the answer is:

pleb

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'in short he certainly wasn't well up in roman history' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Other definitions for pleb that I've seen before include "Term used for a member of the lower classes" , "Person of vulgar tastes (colloq.)" , "Uncultivated type" , "Commoner" , "Boor" .)

I've seen this clue in the Evening Standard.
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