Crossword Genius

Always avoiding delirious angle (4)

Ross

I believe the answer is:

fish

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'angle' is the definition.
(I know that angle can be written as fish)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for fish that I've seen before include "Aquatic vertebrate" , "Angle, troll" , "- - and chips" , "rock, perhaps" , "Weatherman" .)

I've seen this clue in the Sydney Morning Herald.
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