Doctors reveal it's many-sided (9)
I believe the answer is:
versatile
'many-sided' is the definition.
(thesaurus)
'doctors reveal it's' is the wordplay.
'doctors' indicates an anagram.
'reveal'+'its'='revealits'
'revealits' with letters rearranged gives 'VERSATILE'.
(Other definitions for versatile that I've seen before include "Adaptable sort of relatives" , "Good at many things" , "Multiskilled" , "Multifaceted" , "Able to adapt" .)