Cryptic crossword clue
Does up semi with dens or otherwise 10

The most common and most likely answer to this crossword clue is the 10 letter word MODERNISES

I've seen this crossword clue in The Daily Telegraph
M
O
D
E
R
N
I
S
E
S

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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 MODERNISES mean?

MODERNISES verb
  1. To make (something old or outdated) up to date, or modern in style or function by adding or changing equipment, designs, etc.
  2. To become modern in appearance, or adopt modern ways

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