She's sorry for her friend at heart (5)

I believe the answer is:

sadie

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'she's' is the definition.

'sorry for her friend at heart' is the wordplay.
I cannot quite understand how this works, but
'sorry' could be 'sad' (similar in meaning) and 'sad' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for sadie that I've seen is " Woman".)

I've seen this clue in the Evening Standard.

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