Answer concerns area north of Connecticut (5)
I believe the answer is:
react
'answer' is the definition.
(thesaurus)
'concerns area north of connecticut' is the wordplay.
'concerns area' becomes 'rea' (I can't explain this - if you can you should believe this answer much more).
'north of' says to put letters next to each other (in a down clue, some letters go above others).
'connecticut' becomes 'CT' (US postal abbreviation).
'rea'+'ct'='REACT'
Can you help me to learn more?
(Other definitions for react that I've seen before include "Take" , "Perform again" , "Respond to a stimulus" , "Show opposition" , "Behave in response" .)