Attractiveness of everything on river in The Dales (6)
I believe the answer is:
allure
'attractiveness' is the definition.
(allure is a kind of attractiveness)
'everything on river in the dales' is the wordplay.
'everything' becomes 'all' (all things).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'river in the dales' becomes 'ure' (I can't explain this - if you can you should give a lot more credence to this answer).
'all'+'ure'='ALLURE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for allure that I've seen before include "Attractiveness, glamour" , "Entice; appeal" , "Charm, magnetism" , "There's glamour" , "The power to entice or attract" .)