Doctor in wind to take risk (6)
I believe the answer is:
gamble
'risk' is the definition.
(I know that risk can be written as gamble)
'doctor in wind' is the wordplay.
'doctor' becomes 'MB' (Bachelor of Medicine, Medicinae Baccalaureus).
'in' indicates putting letters inside.
'wind' becomes 'gale' (gale is a kind of wind).
'mb' inserted inside 'gale' is 'GAMBLE'.
'to take' acts as a link.
(Other definitions for gamble that I've seen before include "punt" , "Risky enterprise" , "Take a risk" , "Flutter" , "Bet; risky undertaking" .)