Try to prevent doctor accepting summer in France (5)
I believe the answer is:
deter
'try to prevent' is the definition.
(I've seen this before)
'doctor accepting summer in france' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor'**).
'accepting' is an insertion indicator.
'summer in france' becomes 'ete' (').
'dr' going around 'ete' is 'DETER'.
(Other definitions for deter that I've seen before include "Check" , "Put off (from an action)" , "Inhibit" , "Put (someone) off" , "stop" .)