Crossword Genius

Kitchen item, mostly to cut fish (8)

Ross

I believe the answer is:

triangle

I'm a little stuck... Click here to teach me more about this clue!

'kitchen item' is the definition.
(I've seen this before)

'mostly to cut fish' is the wordplay.
I cannot really see how this works, but
'fish' could be 'angle' (angle can mean to fish) and 'angle' is found within the answer.
The remaining letters 'tri' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for triangle that I've seen before include "Three-sided shape" , "Three-sided figure (maths)" , "Polygon, could be isosceles" , "Integral (anag) - figure" , "Constellation - three-sided figure" .)

I've seen this clue in The Times and The Sunday Times.
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