Crossword Genius

Two tunnels under a bridge? (8)

Ross

I believe the answer is:

nostrils

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'two tunnels' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for nostrils that I've seen before include "Slit Ron's nose parts" , "Nose-openings" , "Holes in noses" , "Openings in the nose" , "Openings to the nasal cavity" .)

I've seen this clue in The Telegraph.
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