Gravy goodness in remains of food (11)

I believe the answer is:

breadcrumbs

I'm a little stuck... Click here to teach me more about this clue!

'in remains of food' is the definition.
I can't judge whether this definition defines the answer.

'gravy goodness' is the wordplay.
'gravy' becomes 'bread' (I can't justify this - if you can you should believe this answer much more).
'goodness' becomes 'crumbs' (interjection).
'bread'+'crumbs'='BREADCRUMBS'

Can you help me to learn more?

(Another definition for breadcrumbs that I've seen is " Fragments of loaf".)

I've seen this clue in The Telegraph.

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