Unambiguous order (6)

I believe the answer is:

direct

I believe this is a double definition.

'unambiguous' is the first definition.
(thesaurus)

'order' is the second definition.
(I've seen this before)

(Other definitions for direct that I've seen before include "Straight - guide" , "Show someone the way" , "Supervise; unambiguous" , "By the shortest route" , "Regulate" .)

I've seen this clue in The Guardian and The Telegraph.

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