Scottish pop singer with hit 'Shout' in 1964 (4)

I believe the answer is:

lulu

(Other definitions for lulu that I've seen before include "Outstanding person; singer" , "Berg opera; outstanding thing (colloq.)" , "beauty" , "Glaswegian 60s pop singer" , "Attractive girl" .)

I've seen this clue in The Telegraph.

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