A nosy informer (5)

I believe the answer is:

snout

I'm a little stuck... Click here to teach me more about this clue!

'a nosy informer' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for snout that I've seen before include "Projecting nasal area of animal" , "nose of pig" , "Tobacco -- hooter" , "Nose and mouth of a mammal" , "Animal's muzzle" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.