Crossword Genius

A tidy number of knights? (5)

Ross

I believe the answer is:

order

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'a tidy' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for order that I've seen before include "Instruction - arrangement" , "See 20" , "Command; neatness" , "Family - group - arrangement" , "Regulation" .)

I've seen this clue in the Evening Standard.
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