Crossword Genius

Disappointment expressed when pet has passed away (7)

Ross

I believe the answer is:

doggone

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'disappointment expressed' is the definition.
I can't judge whether this defines the answer.

'pet has passed away' is the wordplay.
'pet' becomes 'dog'.
'has' is a charade indicator (letters next to each other).
'passed away' becomes 'gone' ('go' can be a synonym of 'pass away').
'dog'+'gone'='DOGGONE'

'when' is the link.

Can you help me to learn more?

(Other definitions for doggone that I've seen before include "Infernal" , "expression used by irritated person" .)

I've seen this clue in The Globe and Mail.
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