Crossword Genius

Guess __? (3,4,5)

Ross

There are a few possibilities for this:

Which length description are you looking for?:

4 6 7 8

3,4,5

(Other definitions for who goes there that I've seen before include "Sentry's question" , "Sentry's challenge to unknown person" .)

I've seen this clue in the LA Times.
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