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 see how this works, but
'sorry' could be 'sad' (similar in meaning) and 'sad' is located in the answer.
This explanation may well be incorrect...

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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