The most common and most likely answer to this crossword clue is the 10 letter word TRIPLICATE
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result TRIPLICATE
Buddy explains!
The straight part
We know that "more than double" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than double = triplicate.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 TRIPLICATE mean?
TRIPLICATE noun- The making of three identical copies of something.
- Each of a set of three identical objects or copies.
- To make three identical copies of something.
- To triple.
- Made thrice as much; threefold; tripled.