Miss musical as I enter into clinic (6)
I believe the answer is:
saigon
'miss musical' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'i enter into clinic' is the wordplay.
'enter' becomes 'go' (I am not sure about this - if you are sure you should believe this answer much more).
'into' is an insertion indicator.
'clinic' becomes 'san' (short for sanatorium).
'i'+'go'='igo'
'igo' put within 'san' is 'SAIGON'.
'as' is the link.
Can you help me to learn more?
(Other definitions for saigon that I've seen before include "See 8" , "Asian city once" , "Musical set in Vietnam war - ''Miss . . . . . .''" , "Former name of Ho Chi Minh City" , "city in Asia" .)