Reaching a high degree as doctor, meet Rex (7)
I believe the answer is:
extreme
'reaching a high degree' is the definition.
I can't judge whether this definition defines the answer.
'doctor meet rex' is the wordplay.
'doctor' indicates an anagram.
'meet'+'rex'='meetrex'
'meetrex' is an anagram of 'EXTREME'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for extreme that I've seen before include "Longer than usual" , "Very great; not usual" , "Most distant" , "Unrestrained" , "Anything but moderate" .)