Crossword Genius

What’s sticky Cajun soup giving out bad small (3)

Ross

I believe the answer is:

gum

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'small' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gum that I've seen before include "seal" , "Sticky substance and mouth tissue" , "Gingeva is its technical name" , "Eg, a eucalyptus" , "Chewed sweet" .)

I've seen this clue in The Times.
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