Humdinger (informal) (4)

I believe the answer is:

lulu

(Other definitions for lulu that I've seen before include "UK 14 7 [EURO VISION] entrant" , "Outstanding person; singer" , "Glaswegian 60s pop singer" , "beauty" , "Outstanding example of its kind - Alban Berg opera - Scottish pop singer, b. 1948" .)

I've seen this clue in The Guardian.

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