Move at the end of August, cheap (6)
I believe the answer is:
budget
'cheap' is the definition.
(budget can mean cheap or low-priced)
'move at the end of august' is the wordplay.
'move' becomes 'budge' (to budge is to move slightly).
'at the end of' indicates one should take the final letters.
The final letter of 'august' is 't'.
'budge'+'t'='BUDGET'
(Other definitions for budget that I've seen before include "Fiscal estimate" , "Limit of funds" , "Financial estimate" , "occasion for speech" , "Funding plan" .)