Crossword Genius

Fish heart spurned by talk show host (4)

Ross

I believe the answer is:

opah

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

'fish' is the definition.
(opah is a kind of fish)

'heart spurned by talk show host' is the wordplay.
I cannot really see how this works, but
'heart' could be 'h' (card game abbreviation) and 'h' is found within the answer.
The remaining letters 'opa' 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 opah that I've seen before include "Kingfish" , "Ocean swimmer" , "Large deep-sea fish" .)

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