The most common and most likely answer to this crossword clue is the 4 plus 6 letter word PINA COLADA
I've seen this crossword clue in Independent
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More clues leading to the result PINA COLADA
- Drink from cask, bidding woman to follow
- Dash back with company car once, after a cocktail
- About to welcome ordinary boy – first fix a drink
- Cocktail, a small drink sent over, lay unfinished in the end
- A bit of syrup in a cola daiquiri
- Alcoholic drink prohibited, for a start, in a company car
- Fix a drink, father – cocktail?
- Drink – very good drink with nothing to drink
- Drink quantity of beer, short and a soft drink, with Russian’s agreement
- Dispel a pain with a cold drink
Buddy explains!
The straight part
We know that "a rum cocktail" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a rum cocktail = pina colada.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.