Task master ran disciplined section (6)
I believe the answer is:
errand
'task' is the definition.
(I've seen this before)
'master ran disciplined section' is the wordplay.
'section' indicates a hidden word.
'ERRAND' is hidden in the letters of 'master ran disciplined'.
(Other definitions for errand that I've seen before include "Task, message" , "run one" , "Chore" , "Short journey on behalf of another" , "Commission, task" .)