Cryptic crossword clue
Quartet that’s after 12D 16As for an ageing Beatles number? 4

The most common and most likely answer to this crossword clue is the 4 letter word FOUR

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F
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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 FOUR mean?

FOUR noun
  1. The digit or figure 4; an occurrence thereof.
  2. Anything measuring four units, as length.
  3. A person who is four years old.
  4. An event in which the batsmen run four times between the wickets or, more often, a batsman hits a ball which bounces on the ground before passing over a boundary, resulting in an award of 4 runs for the batting team. If the ball does not bounce before passing over the boundary, a six is awarded instead.
  5. A power forward.
  6. Four-man sweep racing shell, with or without a coxswain.
  7. A four-pennyworth of spirits.
FOUR numeral
  1. A numerical value equal to 4; the number after three and before five; two plus two. This many dots (••••)
  2. Describing a set or group with four elements.

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