Rosy hiker wandering around northern county (9)
I believe the answer is:
yorkshire
'northern county' is the definition.
(I've seen this before)
'rosy hiker wandering' is the wordplay.
'wandering' is an anagram indicator.
'rosy'+'hiker'='rosyhiker'
'rosyhiker' with letters rearranged gives 'YORKSHIRE'.
'around' is the link.
(Other definitions for yorkshire that I've seen before include "North English county" , "Northern area" , "Joe Root's county" , "County divided into three ridings" , "English county noted for relish and pudding with beef" .)