Crossword Genius

School is excellent, but beginning to go bad (4)

Ross

I believe the answer is:

high

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

I believe this is a quadruple definition!!

'school' is the first definition.
(high school is a kind of school)

'is excellent' is the second definition.
(high quality)

'but' is a link.

'beginning' is the third definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'to' is a link.

'go bad' is the fourth definition.
'high' can be an answer for 'bad' (both can describe rotten or decayed food). I am not sure about the 'go' bit.

Can you help me to learn more?

(Other definitions for high that I've seen before include "Oxford street - drunk" , "At altitude" , "Going off - in great spirits" , "Western film with Gary Cooper" , "Tall - loud - under the influence of drugs" .)

I've seen this clue in The Guardian.
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