Crossword Genius

Hot planet's fireplaces (7)

Ross

I believe the answer is:

hearths

'fireplaces' is the definition.
('hearth' can be a synonym of 'fireplace')

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

(Other definitions for hearths that I've seen before include "Fireplace areas" , "Firesides" .)

I've seen this clue in the Sydney Morning Herald.
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