Deplore ban about eastern doctor coming in (6)
I believe the answer is:
bemoan
'deplore' is the definition.
('bemoan' can be a synonym of 'deplore')
'ban about eastern doctor coming in' is the wordplay.
'about' is an insertion indicator.
'eastern' becomes 'e'.
'doctor' becomes 'mo' (medical officer**).
'coming in' indicates putting letters inside.
'ban' going around 'e' is 'bean'.
'bean' placed around 'mo' is 'BEMOAN'.
(Other definitions for bemoan that I've seen before include "Deplore, lament" , "Lament, grieve" , "Complain about, lament" , "Regret, lament" .)