Note number plate on A road (6)
I believe the answer is:
regard
'note' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for regard that I've seen before include "Judge" , "Attitude of admiration or esteem" , "Look at - esteem" , "Watch" , "Think of" .)