### Clue: Drink most commonly sold in bars (9)
### Answer: CHOCOLATE 
 ### Explanation: Definition: Drink,most commonly sold in bars
  Double defn:  1st: The (liquid) drink made from cocoa; and 2nd: the solid form commonly sold in the shape of bars, not to be confused with bars that serve drinks.  Nice surface.  It could be a single cryptic defn. depending on how different one considers the liquid from the solid form.