Mistakenly let in cracking rising double act did sketch (8)

I believe the answer is:

outlined

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'did sketch' is the definition.
('outline' can be a synonym of 'sketch')

I cannot understand how the rest of the clue works.

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(Other definitions for outlined that I've seen before include "Gave summary of chief facts - drew them?" , "Described roughly or briefly" , "Traced" , "Sketched, described briefly" .)

I've seen this clue in The Telegraph.

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