One to march or stroll about in old crown dependency (9)
I believe the answer is:
orangeman
'old crown dependency' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'one to march or stroll about' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' ('a' and 'an' can mean 'one') and 'an' is present in the answer.
'or' is found in the answer.
'about' could be 'a' (abbreviation in Chambers) and 'a' is found within the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for orangeman that I've seen before include "Religious society member" , "one used to marching?" , "Member of a Protestant Irish society" , "Northern Ireland Protestant" .)