Doctor has pie prepared as medical speciality (12)

I believe the answer is:

orthopaedics

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'medical speciality' is the definition.
The definition suggests a singular noun which matches the answer.

'doctor has pie prepared' is the wordplay.
'prepared' is an anagram indicator.
'doctor'+'has'+'pie'='doctorhaspie'
'doctorhaspie' with letters rearranged gives 'ORTHOPAEDICS'.

'as' acts as a link.

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(Other definitions for orthopaedics that I've seen before include "The treatment of bone and muscle disorders" , "Field to operate" .)

I've seen this clue in The Independent.

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