Tunnels side by side near the bridge? (8)
I believe the answer is:
nostrils
'tunnels' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for nostrils that I've seen before include "Openings in nasal cavities" , "Openings in the nose" , "Nose-openings" , "Nose holes" , "Slit Ron's nose parts" .)