Instinctive bite into snappy urchin (11)

I believe the answer is:

guttersnipe

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'urchin' is the definition.
(I know that guttersnipe is a type of urchin)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for guttersnipe that I've seen before include "Street urchin" , "Wretched child" , "Person behaving as one brought up in squalor" , "poor kid" , "Scruffy street child" .)

I've seen this clue in The Guardian.

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