Crossword Genius

Something for Jack to finish breakfast with? (4)

Ross

I believe the answer is:

tart

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

'breakfast with?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's a link between them I don't understand?

'something for jack to finish' is the wordplay.
I cannot really understand how this works, but
'jack' could be 'tar' (both are informal terms for sailor) and 'tar' is present in the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for tart that I've seen before include "Sarcastic" , "Bitter - pudding" , "Sour -- acid" , "Sharp tasting- like kind of pie?" , "A bit sour, like flattish pie" .)

I've seen this clue in the Evening Standard.
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