Crossword Genius

Finishes off boring school soup (6)

Ross

I believe the answer is:

borsch

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

'soup' is the definition.
(I know that Borsch is a type of soup)

'finishes off boring school' is the wordplay.
I cannot really understand how this works, but
'school' could be 'sch' (abbreviation) and 'sch' is found in the answer.
The remaining letters 'bor' is a valid word 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 borsch that I've seen before include "Russian or Polish soup usually containing beet juice" , "Russian beetroot soup" , "Soup made with beetroot" .)

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