Possibly sore after the finish, agree? (7)
I believe the answer is:
endorse
'agree?' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?
'possibly sore after the finish' is the wordplay.
'possibly' indicates anagramming the letters.
'after' is a charade indicator (letters next to each other).
'the finish' becomes 'end' (I've seen this in another clue).
'sore' is an anagram of 'orse'.
'orse' put after 'end' is 'ENDORSE'.
Can you help me to learn more?
(Other definitions for endorse that I've seen before include "Express approval" , "Pass" , "Advocate" , "Affirm" , "Back, sanction" .)