Send over some smooth gin, otherwise, this evening (7)
I believe the answer is:
tonight
'this evening' is the definition.
(synonyms)
'send over some smooth gin otherwise' is the wordplay.
'send over' says the letters should be written backwards (I've seen 'sent over' mean this).
'some' says the answer is hidden in the clue (some parts of the word are used).
'thginot' is hidden in the letters of 'smooth gin otherwise'.
'thginot' back-to-front is 'TONIGHT'.
(Other definitions for tonight that I've seen before include "song from West Side Story" , "On tight (anag.)" , "Selection from West Side Story" , "after supper?" , "Late today" .)