Crossword Genius

An electric blanket when you want central heating? (4,7)

Ross

I believe the answer is:

cold comfort

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'heating?' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for cold comfort that I've seen before include "minimal (if any) soothing" , "farm's out of work" , "Inadequate consolation (on a farm?)" , "a lozenge?" , "Poor compensation" .)

I've seen this clue in the Evening Standard.
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