Upset editor notices plans (7)
I believe the answer is:
designs
'plans' is the definition.
('design' can be a synonym of 'plan')
'upset editor notices' is the wordplay.
'upset' shows that the letters should be reversed in order.
'editor' becomes 'ed' (abbreviation).
'notices' becomes 'signs' ().
'ed' reversed gives 'de'.
'de'+'signs'='DESIGNS'
(Other definitions for designs that I've seen before include "Intentions" , "Plots" , "Plans" , "'Blueprints, patterns (7)'" , "intended purposes" .)