Saddened to be treated like a fish (6)
I believe the answer is:
gutted
'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" .)