Crossword Genius

Saddened to be treated like a fish (6)

Ross

I believe the answer is:

gutted

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'saddened' is the definition.
Although both the answer and definition are past participle verbs, I cannot see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for gutted that I've seen before include "Disappointed (sl.)" , "extremely upset" , "Emptied; upset" , "Very disappointed (as a fish in a fish shop?)" , "With innards removed" .)

I've seen this clue in The Mirror.
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