What does the cryptic crossword clue "Politician chats about parliament and means to maintain warmth (10,5)" mean?

The wordplay uses a charade (building blocks). GREEN (synonym="‘politician’") + HOUSE (synonym="parliament’") + GASES (synonym="‘chats’ – the form GASSES is perhaps more common as a synonym for ‘chats’, but not for the answer") = GREENHOUSEGASES The answer is GREENHOUSEGASES.

Politician chats about parliament and means to maintain warmth (10,5)

Guardian Cryptic #29594 | 1 Across | 2025-01-17 flower

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