Final change to where one would find Fish, the constellation (8)
I believe the answer is:
aquarius
'the constellation' is the definition.
(Aquarius is an example)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for aquarius that I've seen before include "Zodiacal constellation" , "Sign of the zodiac, the water-bearers" , "Sign of the Water-carrier - one of 12 Across" , "Star sign" , "Sign of the water-carriers" .)