Cruciverbalists hiking somewhere in Yorkshire (4,6)
I believe the answer is:
west riding
'cruciverbalists hiking' is the definition.
I can't judge whether this definition defines the answer.
'somewhere in yorkshire' is the wordplay.
'somewhere' becomes 'west' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in yorkshire' becomes 'riding' (one of three geographical divisions of Yorkshire).
'west'+'riding'='WEST RIDING'
Can you help me to learn more?
(Another definition for west riding that I've seen is " Part of Yorkshire".)