Weeps, dropping back in to doctors (6)
I believe the answer is:
droops
'weeps' is the definition.
(both can mean to behave miserably)
'dropping back in to doctors' is the wordplay.
'dropping' becomes 'poo' (informal term for excrement**).
'back' is a reversal indicator.
'in' indicates putting letters inside.
'to doctors' becomes 'drs' ('Dr' can be a synonym of 'doctor').
'poo' backwards is 'oop'.
'oop' put inside 'drs' is 'DROOPS'.
(Other definitions for droops that I've seen before include "Hangs loosely or laxly" , "Languishes" , "Hangs limply down" , "Sags through tiredness" , "'Sags, wilts (6)'" .)