Thing to alter between today and tomorrow? (7)
I believe the answer is:
tonight
'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" .)