Crossword Genius

Hot planet — a place that’s warming (6)

Ross

I believe the answer is:

hearth

'a place that's warming' is the definition.
(fireplace)

'hot planet' is the wordplay.
'hot' becomes 'h' (abbreviation, eg on taps).
'planet' becomes 'earth' (Earth is an example).
'h'+'earth'='HEARTH'

(Other definitions for hearth that I've seen before include "fireside feature" , "Open fireplace" , "suitable place for a fire" , "a warm, welcoming place" , "part of furnace" .)

I've seen this clue in The Times.
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