Snack bar drink (4)
I believe the answer is:
cola
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snack bar drink</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cola that I've seen before include "pop" , "Cold drink" , "Carbonated soft drink" , "Fizzy drink" .)