Doctor can predict one will be clumsy (8-5)
I believe the answer is:
accident-prone
'clumsy' is the definition.
(likely to have accidents)
'doctor can predict one' is the wordplay.
'doctor' is an anagram indicator.
'can'+'predict'='canpredict'
'canpredict' is an anagram of 'accidentpr'.
'accidentpr'+'one'='ACCIDENT-PRONE'
'will be' is the link.
(Other definitions for accident-prone that I've seen before include "Given to mishaps" , "Susceptible to mishap" , "Unusually susceptible to mishaps" , "Given to misadventure" , "Involved in unusually frequent mishaps" .)