Revolutionary can't hope for memorial (8)
I believe the answer is:
cenotaph
'for memorial' is the definition.
(cenotaph is a kind of memorial)
'revolutionary can't hope' is the wordplay.
'revolutionary' indicates anagramming the letters.
'cant'+'hope'='canthope'
'canthope' is an anagram of 'CENOTAPH'.
(Other definitions for cenotaph that I've seen before include "Monument to those killed in war" , "construction in Whitehall" , "What divides Whitehall" , "Whitehall monument" , "Monument built to honour soldiers who died in war" .)