Crossword Genius

Inexperienced legislators giving description of some climate impacts? (10)

Ross

I believe the answer is:

greenhouse

I'm a little stuck... Click here to teach me more about this clue!

'description of some climate impacts?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'inexperienced legislators' is the wordplay.
'inexperienced' becomes 'green' (similar in meaning).
'legislators' becomes 'house' (I can't justify this - if you can you should believe this answer much more).
'green'+'house'='GREENHOUSE'

'giving' acts as a link.

Can you help me to learn more?

(Other definitions for greenhouse that I've seen before include "A place for growing" , "somewhere hot" , "Glass building for rearing plants" , "associated with harmful gases" , "Horticulturalists' glass building" .)

I've seen this clue in The Independent.
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