Stop article by TV doctor (4)
I believe the answer is:
whoa
'stop' is the definition.
(I've seen this before)
'article by tv doctor' is the wordplay.
'article' becomes 'a' (indefinite article).
'by' means one lot of letters go next to another.
'tv doctor' becomes 'who' (I've seen this in other clues).
'a' put after 'who' is 'WHOA'.
(Other definitions for whoa that I've seen before include "Said to stop a horse" , "Command to horse to stop or stand still" , "Danger" , "Stop, Dobbin!" , "The King of rock and roll" .)