Smoothing the end of the day (7)
I believe the answer is:
evening
I believe this is a double definition.
'smoothing' is the first definition.
(as in making something even)
'the end of the day' is the second definition.
(I've seen this before)
(Other definitions for evening that I've seen before include "Ironing" , "The close of a day; a word used in the first ever 2 dn" , "late party" , "Making flat" , "Hours before bedtime" .)