Agrees that Seans about to dig up the road (7)
I believe the answer is:
assents
'agrees that seans' is the definition.
'assents' can be an answer for 'agrees' (I've seen this before). I am not certain of the remainder of the definition.
'about to dig up the road' is the wordplay.
'about' says the letters should be written in reverse.
'to dig' becomes 'nessa' (I can't justify this - if you can you should believe this answer much more).
'up' is a reversal indicator (in down clue: letters go upwards).
'the road' becomes 'st'.
'nessa' back-to-front is 'assen'.
'st' back-to-front is 'ts'.
'assen'+'ts'='ASSENTS'
Can you help me to learn more?
(Other definitions for assents that I've seen before include "Says yes" , "Gives nod" , "Expresses agreement" , "Accedes, acquiesces" , "Agrees, complies" .)