Social Democrat in the end, unfortunately, resigned (7)
I believe the answer is:
stoical
'resigned' is the definition.
(I've seen this before)
'social democrat in the end unfortunately' is the wordplay.
'in the end' suggests the final letters.
'unfortunately' indicates anagramming the letters.
The last letter of 'democrat' is 't'.
'social'+'t'='socialt'
'socialt' is an anagram of 'STOICAL'.
(Other definitions for stoical that I've seen before include "able to endure suffering" , "Long-suffering" , "Showing endurance" , "Uncomplaining in the face of adversity" , "Impassive" .)