Crossword Genius

No-cost energy when very cold (8)

Ross

I believe the answer is:

freezing

'very cold' is the definition.
(I've seen this before)

'no-cost energy' is the wordplay.
'no cost' becomes 'free' (I've seen this in other clues).
'energy' becomes 'zing' (I've seen this before**).
'free'+'zing'='FREEZING'

'when' acts as a link.

(Other definitions for freezing that I've seen before include "Becoming ice" , "Like ice" , "Changing to ice" , "suffering from cold" , "Ice-cold" .)

I've seen this clue in The Guardian.
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