Last bit is removed from aircraft design (4)

I believe the answer is:

plan

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'design' is the definition.
(I know that design is a kind of designate)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plan that I've seen before include "Design; map" , "Scheme - map" , "Programme" , "Devise a way to achieve" , "Layout drawing" .)

I've seen this clue in The Times.

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