Cryptic crossword clue
The Royal Marines love numerical data used for keeping temperature steady 11

The most common and most likely answer to this crossword clue is the 11 letter word THERMOSTATS

I've seen this crossword clue in The Daily Telegraph
T
H
E
R
M
O
S
T
A
T
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 THERMOSTATS mean?

THERMOSTATS noun
  1. A device that automatically responds to changes in temperature by activating a heating or cooling system to maintain the temperature at a desired setting.

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