Monument honouring the fallen (8)
I believe the answer is:
cenotaph
'monument honouring the fallen' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cenotaph that I've seen before include "Monument honouring persons buried elsewhere" , "Monument to people whose remains are interred elsewhere" , "Whitehall memorial" , "Monument to those killed in war" , "Tomb-like monument to people buried elsewhere" .)