Wrongly enter road’s designation (7)
I believe the answer is:
mistype
'wrongly enter road's designation' is the definition.
I can't judge whether this definition defines the answer.
'wrongly enter road's' is the wordplay.
I cannot really understand how this works, but
'enter' could be 'type' (I've seen this in another clue) and 'type' is found within the answer.
'road's' could be 'mis' (resembles M1 motorway) and 'mis' is found 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 mistype that I've seen before include "Write incorrectly (on a keyboard)" , "What poor secretary may do" , "Hit a wrong letter on keyboard" , "Hit the wrong key" , "Make an error in transcription" .)