Soft drink: I'm going without one on the counter (4)
I believe the answer is:
soda
'soft drink' is the definition.
(soda is a kind of soft drink)
'without one on the counter' is the wordplay.
'without' becomes 'dos' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'a'.
'on' means one lot of letters go next to another.
'the counter' says the letters should be written backwards.
'dos' put after 'a' is 'ados'.
'ados' written backwards gives 'SODA'.
'i'm going' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for soda that I've seen before include "Splash served with some spirits" , "Drink containing carbonated water and sometimes flavouring" , "Variety of pop" , "for use with whisky?" , "Soft drink" .)