One patch prepared for memorial (8)
I believe the answer is:
cenotaph
'for memorial' is the definition.
(cenotaph is a kind of memorial)
'one patch prepared' is the wordplay.
'prepared' indicates anagramming the letters.
'one'+'patch'='onepatch'
'onepatch' anagrammed gives 'CENOTAPH'.
(Other definitions for cenotaph that I've seen before include "Empty tomb" , "Monument built to honour soldiers who died in war" , "Monument honouring persons buried elsewhere" , "Feature of Whitehall" , "War memorial" .)