Having only one speed can make you furious! (5)
I believe the answer is:
irate
'furious' is the definition.
(I've seen this before)
'having only one speed can make you' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'speed' could be 'rate' (the speed at which something happens) and 'rate' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for irate that I've seen before include "will be up in arms" , "Extremely cross" , "Magical rod" , "A tier (anag)" , "Angry, enraged" .)