What does the cryptic crossword clue "Article on empty space unit (5)" mean?

The definition is "unit". The wordplay uses charade, deletion. THE (synonym of "Article") + ROOM (synonym of "space") [deletion: "empty"]; definition: "unit" The answer is THERM.

Article on empty space unit (5)

Guardian Cryptic #29603 | 3 Down | 2025-01-28 flower

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