Crossword Genius

Change of speed leads to speed which is reckless (9)

Ross

I believe the answer is:

desperate

'is reckless' is the definition.
(thesaurus)

'change of speed leads to speed' is the wordplay.
'change of' indicates an anagram.
'leads' is a charade indicator (letters next to each other).
'to speed' becomes 'rate' (rate is a kind of speed**).
'speed' with letters rearranged gives 'despe'.
'despe'+'rate'='DESPERATE'

'which' acts as a link.

(Other definitions for desperate that I've seen before include "Eater sped to beyond hope" , "Hopeless; extremely bad" , "Adept seer (anag)" , "Miserable" , "critical" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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