Dr Rory, a Scotsman, could be working here (4,3,8)
I believe the answer is:
ross and cromarty
Here is my best explanation:
'working here' is the definition.
The definition suggests a singular noun which matches the answer.
'dr rory a scotsman could be' is the wordplay.
'could be' is an anagram indicator.
'drroryascotsman' is an anagram of 'ROSS AND CROMARTY'.
(Other definitions for ross and cromarty that I've seen before include "old county" and "Old county".)