County Strasburg (5)
I believe the answer is:
devon
'county' is the definition.
(I know that Devon is a county)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for devon that I've seen before include "County in SW England" , "West country county" , "Raleigh's county" , "Ilfracombe's county" , "part of England?" .)