What Senor and Senora should have listed differently (6)

I believe the answer is:

tildes

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

'what senor and senora should' is the definition.
I can't judge whether this defines the answer.

'listed differently' is the wordplay.
'differently' indicates an anagram.
'listed' anagrammed gives 'TILDES'.

'have' acts as a link.

Can you help me to learn more?

(Other definitions for tildes that I've seen before include "Pronunciation marks over the letter n in Spanish" , "Curly marks" , "Marks over Ns in Spanish" .)

I've seen this clue in The Times.

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