Something broadcast about parking in haste (5)
I believe the answer is:
'haste' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for speed that I've seen before include "Expedition" , "Move quickly (and illegally?)" , "The going rate" , "Pace or tempo" , "Travel quickly" .)