The most common and most likely answer to this crossword clue is the 6 plus 4 letter word BLOODY MARY
I've seen this crossword clue in Independent
B
L
O
O
D
Y
M
A
R
Y
More clues leading to the result BLOODY MARY
- Drink fuddled old boy, joining wrong army
- Old royal beaten up by old mayor
- Drink? Rare politician maintains resistance
- Drink left over in group refreshed army
- Drink by mayor and old drunk
- Old army boy could become queen
- Cruel monarch that gets drunk after mixing it
- Confounded woman that gets mixed up in bar
- That thoroughly unpleasant woman’s cocktail
- Red Queen’s drink
Buddy explains!

The straight part
We know that "queen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case queen = bloody mary.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.