Crossword Genius

Spooner's freezing ear is a nuisance in the street (9)

Ross

I believe the answer is:

litterbug

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'street' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for litterbug that I've seen before include "One leaving papers around" , "filthy devil" , "Person wilfully dropping rubbish" , "Person dropping refuse in public places" , "One likely to drop" .)

I've seen this clue in The Times.
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