Crossword Genius

Power cut? That's a relief (4)

Ross

I believe the answer is:

phew

'that's a relief' is the definition.

'power cut?' is the wordplay.
'power' becomes 'p'.
'cut?' becomes 'hew' (I've seen this before**).
'p'+'hew'='PHEW'

(Other definitions for phew that I've seen before include "Gosh, that's a relief!" , "Exclamation of relief" , "Gosh, I'm sweltering!" , "I'm overheating?" , "thank goodness!" .)

I've seen this clue in The Telegraph.
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