Crossword Genius

Where glasses sit, precisely (2,3,4)

Ross

I believe the answer is:

on the nose

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'precisely' is the definition.
(I know that precisely can be written as on the nose)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for on the nose that I've seen before include "just to take the first place" , "Exactly in America" , "There's a bridge here" , "Not to be placed" , "(In race betting) to win only" .)

I've seen this clue in The Telegraph.
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