Difficult to move North Yorkshire's capital (6)
I believe the answer is:
thorny
'difficult' is the definition.
(similar in meaning)
'move north yorkshire's capital' is the wordplay.
'move' becomes 'thor' (I can't justify this - if you can you should believe this answer much more).
'capital' suggests taking the first letters.
The initial letters of 'north yorkshire' is 'ny'.
'thor'+'ny'='THORNY'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for thorny that I've seen before include "(Of problem) causing difficulty; prickly" , "Unpleasant" , "Causing difficulty - like a bed of roses?" , "Bristling with perplexities" , "Covered in spikes" .)