The most common and most likely answer to this crossword clue is the 9 letter word QUADRUPLE
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More clues leading to the result QUADRUPLE
Buddy explains!
The straight part
We know that "Double! Double!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case double! double! = quadruple.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 QUADRUPLE mean?
QUADRUPLE verb- To multiply by four.
- To increase by a factor of four.
- To provide four parallel running lines on a given stretch of railway.
- Being four times as long, as big or as many of something.