Publicity put up about a Miro abstract exhibition (7)
I believe the answer is:
diorama
'exhibition' is the definition.
(I've seen this before)
'publicity put up about a miro abstract' is the wordplay.
'publicity' becomes 'ad' (advert).
'put up' is a reversal indicator.
'about' is an insertion indicator.
'abstract' indicates an anagram.
'ad' written backwards gives 'da'.
'a'+'miro'='amiro'
'amiro' is an anagram of 'ioram'.
'da' enclosing 'ioram' is 'DIORAMA'.
(Other definitions for diorama that I've seen before include "museum feature" , "Scene with models" , "Miniature 3-D scene -- or a maid (anag)" , "Miniature three- dimensional scene" , "Miniature three-dimensional scene" .)