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' indicates an anagram (each letter get diverted elsewhere).
'by' means one lot of letters go next to another.
'eastern' becomes 'e'.
'harry'+'is'='harryis'
'harryis' with letters rearranged gives '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" .)