Bait in lake and river (4)
I believe the answer is:
lure
'bait' is the definition.
(I know that bait is a kind of lure)
'lake and river' is the wordplay.
'lake' becomes 'L' (geographical abbreviation).
'and' is a charade indicator (letters next to each other).
'river' becomes 'ure' (river in Yorkshire).
'l'+'ure'='LURE'
'in' is the link.
(Other definitions for lure that I've seen before include "draw" , "'Entice, tempt (4)'" , "Entice, bait" , "Temptation" , "Attraction" .)