Find ladder below (3,4)
I believe the answer is:
run down
'find' is the definition.
(I've seen this before)
'ladder below' is the wordplay.
'ladder' becomes 'run' ('run' can be a synonym of 'ladder').
'below' becomes 'down' (I've seen this in other clues).
'run'+'down'='RUN-DOWN'
(Other definitions for run down that I've seen before include "Summary; debilitated" , "Indisposed" , "slate" , "exhaust?" , "Hit by car" .)