Thing to put out at the end of today (7)
I believe the answer is:
'the end of today' is the definition.
(I've seen this before)
'thing to put out' is the wordplay.
'put out' indicates anagramming the letters.
'thingto' is an anagram of 'TONIGHT'.
'at' is the link.
(Other definitions for tonight that I've seen before include "Late today" , "Later today" , "What follows today" , "West Side Story number" , "Hotting (anag.)" .)