Reputed, when I left, to be unhappy (3)

I believe the answer is:

sad

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This clue might be a double definition.

'reputed when i left' is the first definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

'be unhappy' is the second definition.
(synonyms)

'to' acts as a link.

Can you help me to learn more?

(Other definitions for sad that I've seen before include "Dismal" , "Heavy-hearted" , "Downcast" , "Miserable" , "Melancholy, triste" .)

I've seen this clue in the Evening Standard.

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