Doctor, in the morning, put on a show (5)
I believe the answer is:
drama
'show' is the definition.
(I've seen this before)
'doctor in the morning put on a' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'in the morning' becomes 'am' (AM on a clock).
'put on' says to put letters next to each other (some letters go on or after others).
'dr'+'am'+'a'='DRAMA'
(Other definitions for drama that I've seen before include "Exciting play or event" , "Literary genre for the theatre" , "spectacle of emotion" , "Literary play" , "Hamlet, say" .)