Sushi ingredient eaten by senorita (4)

I believe the answer is:

nori

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

'sushi ingredient' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'eaten by senorita' is the wordplay.
'eaten by' says the answer is hidden in the clue.
'NORI' can be found hidden inside 'senorita'.

Can you help me to learn more?

(Other definitions for nori that I've seen before include "seaweed" , "oriental food" , "Japanese food" .)

I've seen this clue in The Independent.

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