Attraction of every Yorkshire river (6)
I believe the answer is:
allure
'attraction' is the definition.
(I know that allure is a type of attraction)
'every yorkshire river' is the wordplay.
'every' becomes 'all' (similar in meaning).
'yorkshire river' becomes 'ure' (River Ure).
'all'+'ure'='ALLURE'
'of' acts as a link.
(Other definitions for allure that I've seen before include "Power to attract by personal charm" , "Seduce" , "Tempt" , "There's glamour" , "Powerful attraction" .)