A GP's tutored a funny wannabe doctor perhaps (12)

I believe the answer is:

postgraduate

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'wannabe doctor perhaps' is the definition.
I can't judge whether this definition defines the answer.

'a gp's tutored a funny' is the wordplay.
'funny' is an anagram indicator.
'a'+'gps'+'tutored'+'a'='agpstutoreda'
'agpstutoreda' with letters rearranged gives 'POSTGRADUATE'.

Can you help me to learn more?

(Other definitions for postgraduate that I've seen before include "advanced student" , "Senior student" , "Research student" , "Continuing student" , "Person studying after obtaining a degree" .)

I've seen this clue in The Telegraph.

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