Cryptic crossword clue
Greatly increase output of ducal art and equip … 13

The most common and most likely answer to this crossword clue is the 13 letter word QUADRUPLICATE

I've seen this crossword clue in The Times
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The straight part
We know that "Greatly increase" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case greatly increase = quadruplicate.
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 QUADRUPLICATE mean?

QUADRUPLICATE noun
  1. In quadruplicate: four times over, in four copies
QUADRUPLICATE verb
  1. To replicate four times; to make fourfold; to quadruple.
QUADRUPLICATE adjective
  1. Having four parts
  2. Four times over, multiplied by four

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