One imagines she's out of this world (5)

I believe the answer is:

venus

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'world' is the definition.
('world' could refer to any planet)

I cannot understand how the rest of the clue works.

(Other definitions for venus that I've seen before include "our Neighbour" , "Roman goddess of love" , "Solar system planet" , "Brightest planet" , "not really a star" .)

I've seen this clue in the Evening Standard.

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