Get stuck into bread topper (3)

I believe the answer is:

jam

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'get stuck' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for jam that I've seen before include "problem" , "Fruit preserve" , "Troublesome situation" , "Preserve; pack tightly" , "Spread; improvise (jazz)" .)

I've seen this clue in the Sydney Morning Herald.

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