Clue: Fleischer film disregarding obstruction of Algerian nationalist leader (5)
Answer: ABBAS
Explanation: Definition: Algerian nationalist leader 
(bar)**ABBAS** 
This was a doubly obscure clue in that neither *Barabbas*, the 1961 Richard Fleischer biblical movie, nor Ferhat Abbas, the provisional leader of the not-yet independent Algeria (1958-61), is particularly well-known, it could be argued.