Doctor able to make a speech very detailed (9)
I believe the answer is:
elaborate
'very detailed' is the definition.
(I've seen this before)
'doctor able to make a speech' is the wordplay.
'doctor' is an anagram indicator.
'to make a speech' becomes 'orate' (I've seen this in other clues).
'able' anagrammed gives 'elab'.
'elab'+'orate'='ELABORATE'
(Other definitions for elaborate that I've seen before include "Work out or describe in detail" , "Complicated or fancy" , "Describe in detail, being complicated" , "Highly detailed" , "with added detail" .)