Hostess to an extent in short dress (6)

I believe the answer is:

geisha

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'hostess' is the definition.
(Japanese woman hosting or entertaining men)

I don't understand the rest of the clue.

(Other definitions for geisha that I've seen before include "A Japanese woman who entertains men" , "Jap. hostess" , "Japanese paid companion" , "He's a GI (anag.)" , "Japanese girl trained to entertain men" .)

I've seen this clue in The Times.

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