Number of 101-Acrosses in [see circled letters] (5)

I believe the answer is:

three

(Other definitions for three that I've seen before include "Sixth root of seven hundred and twenty nine" , "Feet in 3 Down" , "Number constituting a crowd?" , "Small number that still makes a crowd?" , "Subject of 1 9" .)

I've seen this clue in The New York Times.

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