Gather what you have to do with the DIY kit? (8)

I believe the answer is:

assemble

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'gather' is the definition.
('assemble' can be a synonym of 'gather')

I can't explain the remainder of the clue.

(Other definitions for assemble that I've seen before include "Gather or congregate together" , "Come or bring group together" , "Gather together in one place" , "Collect in one place" , "Get together" .)

I've seen this clue in the Evening Standard.

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