Squander the budget? (5)
I believe the answer is:
spend
This clue is a double definition.
'squander' is the first definition.
(I know that squander is a more specific form of the action spend)
'the budget?' is the second definition.
(thesaurus)
(Other definitions for spend that I've seen before include "While away" , "Pay out (on goods)" , "Blue" , "Blow" , "amount" .)