Memorial’s not cheap, unfortunately (8)
I believe the answer is:
cenotaph
'memorial's' is the definition.
(cenotaph is a kind of memorial)
'not cheap unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'not'+'cheap'='notcheap'
'notcheap' is an anagram of 'CENOTAPH'.
(Other definitions for cenotaph that I've seen before include "Tomb-like monument to people buried elsewhere" , "Whitehall memorial" , "Monument honouring the fallen" , "Monument built to honour soldiers who died in war" , "What divides Whitehall" .)