Cryptic crossword clue
Hearst limo engineered to keep at constant temperature 10

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

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "at constant temperature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at constant temperature = isothermal.
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 ISOTHERMAL mean?

ISOTHERMAL noun
  1. An isotherm
ISOTHERMAL adjective
  1. Of or pertaining to a process that takes place at constant temperature
  2. Of or pertaining to an isotherm

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