Ambassador travels by horse around British Isles (8)
I believe the answer is:
hebrides
'isles' is the definition.
(I've seen this before)
'ambassador travels by horse around british' is the wordplay.
I cannot quite understand how this works, but
'ambassador' could be 'he' (His or Her Excellency) and 'he' is found in the answer.
'travels' could be 'rides' (ride is a kind of travel) and 'rides' is found in the answer.
'british' could be 'b' (abbreviation e.g. in BBC) and 'b' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hebrides that I've seen before include "overture" , "Scottish islands" , "Strangely, his breed comes from Scottish archipelago" , "His breed comes from west of Scotland" , "Islands off north-west Scotland" .)