Crossword Genius

Occupy university, including bit that's left (7)

Ross

I believe the answer is:

residue

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

'left' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'occupy university including bit' is the wordplay.
I cannot really understand how this works, but
'university' could be 'u' (abbreviation for university) and 'u' is found within the answer.
'occupy' could be 'reside' (synonyms) and 'reside' is located in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for residue that I've seen before include "Part remaining" , "Net worth of estate" , "What remains of something" , "Leftovers" , "Something remaining" .)

I've seen this clue in The Mirror.
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