Crossword Genius

Carbon level trend (5)

Ross

I believe the answer is:

craze

'trend' is the definition.
(craze is a kind of trend)

'carbon level' is the wordplay.
'carbon' becomes 'C' (C is the chemical symbol for carbon).
'level' becomes 'raze' (synonyms).
'c'+'raze'='CRAZE'

(Other definitions for craze that I've seen before include "latest thing" , "Fad, short-lived enthusiasm" , "Make cracks" , "Produce fine cracks in (a surface)" , "Sudden widespread enthusiasm (for something)" .)

I've seen this clue in The Sunday Times and The Times.
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