Englishman perhaps saying goodbye to Boyne Valley area (4)
I believe the answer is:
tara
'englishman perhaps saying goodbye' is the definition.
I can't judge whether this definition defines the answer.
'boyne valley area' is the wordplay.
'boyne valley' becomes 'tar' (I can't explain this - if you can you should give a lot more credence to this answer).
'area' becomes 'a' (maths abbreviation).
'tar'+'a'='TARA'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for tara that I've seen before include "Meath seat of ancient high kings" , "Gone with the Wind mansion" , "Ancient place of coronation in Ireland" , "Ancient Irish royal site" , "Ancient site in Ireland" .)