Crossword Genius

Hot wire warmer (6)

Ross

I believe the answer is:

hearth

'warmer' is the definition.
(hearth is a fireplace)

'hot wire' is the wordplay.
'hot' becomes 'h' (abbreviation eg on taps).
'wire' becomes 'earth' (an earth or ground wire in electronics).
'h'+'earth'='HEARTH'

(Other definitions for hearth that I've seen before include "where the home is built?" , "cosy setting" , "Area around the fire" , "Novel" , "suitable place for a fire" .)

I've seen this clue in The Guardian.
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