The most common and most likely answer to this crossword clue is the 8 plus 7 letter word NORTHERN IRELAND
I've seen this crossword clue in The Sunday Telegraph
N
O
R
T
H
E
R
N
I
R
E
L
A
N
D
More clues leading to the result NORTHERN IRELAND
- Odd denial about Railtrack’s head supporting an underground line for this part of the UK
- Intern or handler disorientated in part of the UK
- Leader of Nationalists and I can represent this part of island
- Country dinner earl organised to back ex-PM
- Hardliner on rent upset half a dozen counties
- Down here, with empty larder another dinner's off
- Neither Rand nor pound can be exchanged here
- Country dinner rather long mostly to prepare
Buddy explains!
The straight part
We know that "part of island" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of island = northern ireland.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.