Crossword Genius

Little bit of dessert Alex essentially leaves (5)

Ross

I believe the answer is:

crumb

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'little bit' is the definition.

I cannot understand how the remainder of the clue works.

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(Other definitions for crumb that I've seen before include "of the farmhouse?" , "Flake of bread" , "Morsel of bread" , "offering a little comfort" , "Tiny piece of bread or cake" .)

I've seen this clue in The Telegraph.
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