Thing to put in order this evening (7)

I believe the answer is:

tonight

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'this evening' is the definition.
(synonyms)

'thing to put in order' is the wordplay.
'thing to' can be anagrammed to 'TONIGHT'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for tonight that I've seen before include "after supper?" , "Later this evening" , ""Not ____, Josephine!"" , "late in the day" , "the coming time for retirement" .)

I've seen this clue in The Telegraph.

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