Annul even in court? (3,5)

I believe the answer is:

set aside

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'annul' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for set aside that I've seen before include "Fallow" , "Reserve for future use" , "Farm land taken out of production" , "Reserve(d) in advance" , "kept for later" .)

I've seen this clue in The Globe and Mail.

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