Cryptic crossword clue
Cutting temperatures toughens tree out in conservatory 10

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

I've seen this crossword clue in The Daily Telegraph
G
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Buddy explains!

The straight part
We know that "conservatory" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case conservatory = greenhouse.
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 GREENHOUSE mean?

GREENHOUSE noun
  1. A building used to grow plants, particularly one with large glass windows or plastic sheeting to trap heat from sunlight even in intemperate seasons or climates.
  2. The glass of a plane's cockpit.
  3. A structure that shields the operating table to protect against bacteria.
  4. A hot state in global climate.
GREENHOUSE verb
  1. To place (plants) in a greenhouse.
  2. To nurture in order to promote growth.

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