A doctor goes round the French scene of massacre (5)
I believe the answer is:
alamo
'scene of massacre' is the definition.
(I've seen this before)
'a doctor goes round the french' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'goes round' is an insertion indicator.
'the french' becomes 'la' ('the' in French).
'a'+'mo'='amo'
'amo' going around 'la' is 'ALAMO'.
(Other definitions for alamo that I've seen before include "Davy Crockett's last stand" , "Famous battle in Texas and John Wayne film" , "The --, Texan mission besieged in 1836" , "Mexicans invested in Texas" , "Historic Texas mission station" .)