Rubbish is on acre plot (8)
I believe the answer is:
scenario
'plot' is the definition.
(I've seen this before)
'rubbish is on acre' is the wordplay.
'rubbish' is an anagram indicator (a poor quality or rubbish spelling of the letters).
'is'+'on'+'acre'='isonacre'
'isonacre' is an anagram of 'SCENARIO'.
(Other definitions for scenario that I've seen before include "Film/novel plot outline" , "Film treatment" , "Postulated sequence of events" , "Dramatic situation" , "Outline of film, novel, etc" .)