Cryptic crossword clue
Broke into cask and retrieved last of claret inside 6

The most common and most likely answer to this crossword clue is the 6 letter word STAVED

I've seen this crossword clue in Financial Times
S
T
A
V
E
D

Buddy explains!

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.

What does STAVED mean?

STAVED verb
  1. To fit or furnish with staves or rundles.
  2. (usually with 'in') To break in the staves of; to break a hole in; to burst.
  3. (with 'off') To push, or keep off, as with a staff.
  4. (usually with 'off') To delay by force or craft; to drive away.
  5. (rare or archaic) To burst in pieces by striking against something.
  6. To walk or move rapidly.
  7. To suffer, or cause to be lost by breaking the cask.
  8. To render impervious or solid by driving with a calking iron.

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