Leave out some Merlot -- I'm often coming over (4)
I believe the answer is:
omit
'leave out' is the definition.
('omit' can be a synonym of 'leave out')
'some merlot i'm often coming over' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'coming over' is a reversal indicator.
'timo' is hidden within 'merlot im often'.
'timo' reversed gives 'OMIT'.
(Other definitions for omit that I've seen before include "Leave something out" , "Disregard" , "Exclude; forget to include" , "Fail to mention" , "Don't include" .)