It has its limitations on the road (5)
I believe the answer is:
speed
'limitations on the road' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'it has its' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is found within the answer.
The remaining letters 'sped' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for speed that I've seen before include "Alacrity" , "Pace or tempo" , "Dispatch" , "Travel quickly" , "Hasten" .)