One patch is laid out as a memorial (8)
I believe the answer is:
cenotaph
'a memorial' is the definition.
(cenotaph is a kind of memorial)
'one patch is laid out' is the wordplay.
'is laid out' is an anagram indicator.
'one'+'patch'='onepatch'
'onepatch' is an anagram of 'CENOTAPH'.
'as' is the link.
(Other definitions for cenotaph that I've seen before include "Feature of Whitehall" , "Whitehall memorial" , "Tomb-like monument to people buried elsewhere" , "Monument to those killed in war" , "Monument honouring persons buried elsewhere" .)