Nominally half a mile on a road (7)

I believe the answer is:

leonard

I'm a little stuck... Click here to teach me more about this clue!

'nominally half' is the definition.
The definition suggests a singular noun which matches the answer.

'a mile on a road' is the wordplay.
'a mile on' becomes 'leon' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'road' becomes 'rd' (abbreviation).
'leon'+'a'+'rd'='LEONARD'

Can you help me to learn more?

(Other definitions for leonard that I've seen before include "Fellow" , "-- Bernstein, US conductor" , "Elmore ___ , US thriller writer, d. 2013" , "man" , "-- Cohen, singer" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.