It's a great change for her (5)

I believe the answer is:

greta

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

'her' is the definition.

'it's a great change' is the wordplay.
'great' anagrams to 'GRETA'.
But, I'm not sure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for greta that I've seen before include "lady" , ".....Garbo, who wanted to be alone" , "'I want to be alone' - ?.. Garbo (5)" , "- Garbo, Swed. actress" , "The familiar Ms Garbo, solitary film star" .)

I've seen this clue in The Globe and Mail.

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