Road mended with it becomes neat (6)
I believe the answer is:
adroit
'neat' is the definition.
(similar in meaning)
'road mended with it' is the wordplay.
'mended with' indicates anagramming the letters (I've seen 'mending with' mean this (I've seen this in other clues)).
'road' anagrammed gives 'adro'.
'adro'+'it'='ADROIT'
'becomes' acts as a link.
(Other definitions for adroit that I've seen before include "Deft and proficient" , "Quick and deft" , "Skilful, expert" , "Skilful, dexterous" , "handy" .)