Don't just lie there! Dress! (3-2)

I believe the answer is:

get-up

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'dress' is the definition.
(I know that dress is a is a more specific form of the action of get up)

I don't understand the rest of the clue.

(Other definitions for get-up that I've seen before include "Outfit" , "Unusual or elaborate costume" , "Style of dress" , "Jump out of bed" .)

I've seen this clue in the Evening Standard.

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