Leading performer nude? Not half (4)

Ross

I believe the answer is:

star

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'leading performer' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for star that I've seen before include "Red Dwarf?" , "Celebrity in the world of entertainment" , "Brilliant performer?" , "Chaste, pure" , "Leading character" .)

I've seen this clue in The Independent.

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