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Tidy instruction for the anagram solver (3,2,5)

Ross

I think it could be either:

put in order

set in order

I'm a little stuck... Click here to teach me more about this clue!

'tidy' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'instruction for the anagram solver' is the wordplay.
'instruction' becomes 'order' (an order to do something).
'for' means one lot of letters go next to another (I've seen this in other clues).
'the anagram solver' becomes 'setin' (I can't explain this - if you can you should give a lot more credence to this answer).
'order' put after 'setin' is 'SET IN ORDER'.

Can you help me to learn more?

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