Daniel —, Irish nationalist leader known as The Liberator who died in 1847 (8)
I believe the answer is:
oconnell
(Other definitions for oconnell that I've seen before include "Daniel .'. . . . . . ., the great Irish Liberator (1'7)" , "Dublin's main street" , "Old Irish politician" , "Daniel ........ was called the Liberator" , "Daniel, remembered in main street (1'7)" .)