Stir created by incomplete financial plan (5)
I believe the answer is:
budge
'stir' is the definition.
(I know that stir can be written as budge)
'incomplete financial plan' is the wordplay.
'incomplete' means to remove the last letter.
'financial plan' becomes 'budget' (I've seen this before).
'budget' with its last letter taken off is 'BUDGE'.
'created by' is the link.
(Other definitions for budge that I've seen before include "Pompous" , "Cornish resort" , "Stiff" , "Move slightly - perhaps in opinion" , "Change an opinion" .)