Doctor with little work in the fall (4)
I believe the answer is:
drop
'the fall' is the definition.
('drop' can be a synonym of 'fall')
'doctor with little work' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'with' is a charade indicator (letters next to each other).
'little work' becomes 'op'.
'dr'+'op'='DROP'
'in' is the link.
(Other definitions for drop that I've seen before include "Go to ground" , "Fall down after prod" , "lower" , "to omit the > smallest amount" , "Small quantity of liquid" .)