Short pronouncement welcomed by second doctor (6)
I believe the answer is:
medico
'doctor' is the definition.
('medico' can be a synonym of 'doctor')
'short pronouncement welcomed by second' is the wordplay.
'short' means to remove the last letter.
'pronouncement' becomes 'edict' (I've seen this before).
'welcomed by' indicates putting letters inside (I've seen this in other clues).
'second' becomes 'mo' (both are short periods of time).
'edict' with its final letter taken away is 'edic'.
'edic' placed within 'mo' is 'MEDICO'.
(Other definitions for medico that I've seen before include "Health practitioner" , "quack" , "Doctor" .)