American subject taking in English and Irish county (5)
I believe the answer is:
meath
'irish county' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for meath that I've seen before include "Irish county of ancient kings, site of Tara" , "part of Ireland" , "County NW of Dublin" , "Tara's county" , "lost province" .)