1968 musical film directed by Robert Wise based upon the life and career of Gertrude Lawrence (4)

I believe the answer is:

star

(Other definitions for star that I've seen before include "Eg, Rigel, Aldebaran" , "Astronomer - dreamer" , "Celeb" , "Principal actor in a film" , "It twinkles" .)

I've seen this clue in The Independent.

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