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Shift a key around, half inserted (7)

Ross

I believe the answer is:

chemise

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'shift' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

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(Other definitions for chemise that I've seen before include "Shift" , "garment" , "Woman's sleeveless undergarment" , "Loose-fitting dress without a waist" , "Smock" .)

I've seen this clue in The Daily Express.
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