Pain in the neck? Medic rang regularly (4)
I believe the answer is:
drag
'pain in the neck?' is the definition.
(thesaurus)
'medic rang regularly' is the wordplay.
'medic' becomes 'dr' (doctor).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternating letters of 'rang' are 'ag'.
'dr'+'ag'='DRAG'
(Other definitions for drag that I've seen before include "Pull against a resistance" , "Obstacle to progress" , "Haul - queen's garb?" , "Tedious experience" , "Become tedious" .)