Crossword Genius

Cutting temperatures toughens tree out in conservatory (10)

Ross

I believe the answer is:

greenhouse

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'conservatory' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for greenhouse that I've seen before include "see-through construction" , "A place for growing" , "Glass building for rearing plants" , "Horticulturalists' glass building" , "somewhere hot" .)

I've seen this clue in The Telegraph.
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