Carry straight on undressing house guest (5)

I believe the answer is:

segue

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'carry straight on' is the definition.
(to segue is to carry on smoothly)

I can't explain the rest of the clue.

(Other definitions for segue that I've seen before include "Play on" , "Change smoothly from one thing to another" , "carry on" , "Move smoothly from one musical piece to another" , "Follow on seamlessly" .)

I've seen this clue in The Times.

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