Attraction of the river on the left (4)
I believe the answer is:
lure
'attraction' is the definition.
(lure is a kind of attraction)
'river on the left' is the wordplay.
'river' becomes 'ure' (river in Yorkshire).
'on' says to put letters next to each other.
'the left' becomes 'L' (common abbreviation).
'ure' after 'l' is 'LURE'.
'of the' is the link.
(Other definitions for lure that I've seen before include "Entice, bait" , "Tempt with some kind of reward" , "'Decoy, bait (4)'" , "Tempt invoking rule" , "Attraction" .)