One falsely imprisoned doctor you upset — endless commotion (7)
I believe the answer is:
dreyfus
'one falsely imprisoned' is the definition.
(falsely imprisoned in the Dreyfus affair 1894-1899)
'doctor you upset endless commotion' is the wordplay.
'doctor' becomes 'dr' (synonyms).
'you' becomes 'ye'.
'upset' says the letters should be written backwards.
'endless' means to remove the last letter.
'commotion' becomes 'fuss' (fuss is a kind of commotion).
'ye' backwards is 'ey'.
'fuss' with its last letter removed is 'fus'.
'dr'+'ey'+'fus'='DREYFUS'
(Other definitions for dreyfus that I've seen before include "French army officer" , "- Affair, in which Zola was involved" , "French captain, wrongly convicted 1894" , "The - Affair in France concerned a wrongly imprisoned officer" , "Frenchman involved in affair" .)