A mural is concocted to accommodate 100 images (9)
I believe the answer is:
simulacra
'images' is the definition.
('simulacrum' can be a synonym of 'image')
'a mural is concocted to accommodate 100' is the wordplay.
'concocted' is an anagram indicator.
'to accommodate' is an insertion indicator.
'100' becomes 'c' (roman numeral).
'a'+'mural'+'is'='amuralis'
'amuralis' is an anagram of 'simulara'.
'simulara' placed around 'c' is 'SIMULACRA'.
(Other definitions for simulacra that I've seen before include "Representations (of someone/something)" , "Copies" , "Poor imitations" , "Representational images" , "Superficial impressions" .)