At Easter she's a changed woman (6)

I believe the answer is:

teresa

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'woman' is the definition.

'at easter she's a changed' is the wordplay.
'easter' can be anagrammed to 'TERESA'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for teresa that I've seen before include "Woman" , "Mother . . . . . ., saintly nun of Calcutta" , "Mother...saintly nun of Calcutta" , "Mother of Calcutta, 1910-97" , "Saint" .)

I've seen this clue in the Evening Standard.

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