Financial plan: move before end of August (6)
I believe the answer is:
budget
'financial plan' is the definition.
(I've seen this before)
'move before end of august' is the wordplay.
'move' becomes 'budge' (to budge is to move slightly).
'before' is a charade indicator (letters next to each other).
'end of' says to take the final letters.
The last letter of 'august' is 't'.
'budge'+'t'='BUDGET'
(Other definitions for budget that I've seen before include "Financial plan - inexpensive" , "occasion for speech" , "Chancellor's plan" , "Plan for expenditure and fund allocation" , "Allocate funds" .)