Flapper has to call a doctor back (7)

I believe the answer is:

buzzard

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'flapper' is the definition.
(buzzard is a kind of bird)

'to call a doctor back' is the wordplay.
'to call' becomes 'buzz' (I am not sure about this - if you are sure you should believe this answer much more).
'doctor' becomes 'Dr' (abbreviation).
'back' is a reversal indicator.
'dr' reversed gives 'rd'.
'buzz'+'a'+'rd'='BUZZARD'

'has' acts as a link.

Can you help me to learn more?

(Other definitions for buzzard that I've seen before include "Large hawk-like bird of prey" , "Kind of big hawk or grasping person" , "Predatory hawk" , "See 20" , "Raptor" .)

I've seen this clue in The Independent.

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