Crossword Genius

I see one fish (3)

Ross

I believe the answer is:

ahi

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

'fish' is the definition.
I know nothing about this answer so I can't tell whether this works.

'i see one' is the wordplay.
'i see' becomes 'ah' ('ah' can be used to express understanding).
'one' becomes 'i' (Roman numeral).
'ah'+'i'='AHI'

Can you help me to learn more?

(Another definition for ahi that I've seen is " tuna".)

I've seen this clue in The Independent.
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