Harry is diverted by eastern part of Scotland (8)
I believe the answer is:
ayrshire
'part of scotland' is the definition.
(I've seen this before)
'harry is diverted by eastern' is the wordplay.
'diverted' is an anagram indicator (letters must be diverted to different positions).
'by' is a charade indicator (letters next to each other).
'eastern' becomes 'e'.
'harry'+'is'='harryis'
'harryis' is an anagram of 'ayrshir'.
'ayrshir'+'e'='AYRSHIRE'
(Other definitions for ayrshire that I've seen before include "Burns's county" , "Breed of dairy cattle has rye hairs" , "Historic county of Scotland" , "Scottish cattle region" , "Old county; cattle breed" .)