Leave college in disappointment (8)

I believe the answer is:

comedown

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'disappointment' is the definition.
(comedown can mean a disappointment or anti-climax)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for comedown that I've seen before include "Loss of status, disappointment" , "Loss of position or status" , "Anticlimax" , "Decline in status" , "Do cowmen experience a loss of status?" .)

I've seen this clue in The Times.

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