She may nag if we upset her (4)

I believe the answer is:

wife

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

'she' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'nag if we upset her' is the wordplay.
'if we' anagrams to 'WIFE'.
Though, I'm unsure how this is indicated.

'may' acts as a link.

Can you help me to learn more?

(Other definitions for wife that I've seen before include "Married woman" , "Better half" , "Spouse" , "Partner in marriage" , "Dutch (slang)" .)

I've seen this clue in the Evening Standard.

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