Angry that there's only one speed (5)
I believe the answer is:
irate
'angry that there's only' is the definition.
'irate' can be an answer for 'angry' (irate can mean angry or annoyed). I am not certain of the rest of the definition.
'one speed' is the wordplay.
'one' becomes 'i' (Roman numeral).
'speed' becomes 'rate' (both can mean pace).
'i'+'rate'='IRATE'
Can you help me to learn more?
(Other definitions for irate that I've seen before include "Annoyed, nettled" , "Ticked off" , "Fuming" , "having got in wax" , "Mad" .)