Crossword Genius

A crowd, figuratively speaking? (5)

Ross

I believe the answer is:

three

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'a crowd' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for three that I've seen before include "There (anag.)" , "III" , "Number of Dumas's musketeers" , "... number of his "Steps to Heaven"" , "Cardinal number" .)

I've seen this clue in the Evening Standard.
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