Stoop to providing an incomplete design (5)

I believe the answer is:

deign

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'stoop' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for deign that I've seen before include "Do something that's below one's dignity" , "Lower oneself" , "Think fit" , "Think appropriate" , "Condescend; stoop" .)

I've seen this clue in the Evening Standard.

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