Crossword Genius

Silly dunny turned into fish (7)

Ross

I believe the answer is:

foolish

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

'silly' is the definition.
(I know that silly can be written as foolish)

'dunny turned into fish' is the wordplay.
I cannot really see how this works, but
'fish' could be 'fool' (synonyms) and 'fool' is located in the answer.
The remaining letters 'ish' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for foolish that I've seen before include "Silly, lacking common sense" , "Absurd, not sensible" , "Unwise or ridiculous" , "Half-baked" , "Idiotic" .)

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