She sang wildly about her sweetheart! (5)

I believe the answer is:

agnes

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'she' is the definition.

I can't explain the remainder of the clue.

(Other definitions for agnes that I've seen before include "Tube for cables" , "David's second wife" , "lass" , "Scandinavian singer" , "The Eve of St. - (Keats)" .)

I've seen this clue in the Evening Standard.

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