Chairman welcomes doctor to dance (5)
I believe the answer is:
mambo
'dance' is the definition.
(thesaurus)
'chairman welcomes doctor' is the wordplay.
'chairman' becomes 'mao' (I've seen this before).
'welcomes' means one lot of letters goes inside another (in sense of 'invites in').
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'mao' placed around 'mb' is 'MAMBO'.
'to' acts as a link.
(Other definitions for mambo that I've seen before include "Dance derived from voodoo rituals" , "voodoo woman" , "Latin American dance of Haitian origin" , "Quick Caribbean dance" , "voodoo priestess" .)