Reckless speed! Reckless speed! (9)
I believe the answer is:
desperate
'reckless' is the definition.
(I've seen this before)
'speed reckless speed' is the wordplay.
'reckless' is an anagram indicator.
'speed' becomes 'rate' (the speed at which something happens).
'speed' with letters rearranged gives 'despe'.
'despe'+'rate'='DESPERATE'
(Other definitions for desperate that I've seen before include "Feeling hopeless" , "Without hope" , "Anguished" , "Adept seer (anag)" , "Having lost all hope" .)