Crossword Genius

Fishy state for aunt to be in (4)

Ross

I believe the answer is:

tuna

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

'fishy state' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'aunt to be in' is the wordplay.
'aunt' can be anagrammed to 'TUNA'.
But, I'm not clear how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for tuna that I've seen before include "A fish; sounds like piano juster" , "Widely-eaten fish" , "Type of fish" , "Large fish for the strange aunt" , "Large sea-fish" .)

I've seen this clue in the Evening Standard.
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