Odd bits of plot, ours, disappointing (4)
I believe the answer is:
poor
'disappointing' is the definition.
(thesaurus)
'odd bits of plot ours' is the wordplay.
'odd bits of' means one should take alternating letters.
'plot'+'ours'='plotours'
The alternating letters of 'plotours' are 'POOR'.
(Other definitions for poor that I've seen before include "On low income" , "Inadequate" , "Having little money or means" , "Impoverished" , "Needy; meagre" .)