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Thing to alter between today and tomorrow? (7)

Ross

I believe the answer is:

tonight

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

'today and tomorrow?' is the definition.
I can't tell whether this definition defines the answer.

'thing to alter' is the wordplay.
'alter' indicates an anagram.
'thing'+'to'='thingto'
'thingto' with letters rearranged gives 'TONIGHT'.

'between' acts as a link.

Can you help me to learn more?

(Other definitions for tonight that I've seen before include "On tight (anag.)" , "Later this evening" , "Later today" , "Got thin (anag)" , "the coming time for retirement" .)

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