Budget speech lacking nothing (6)
I believe the answer is:
ration
'budget' is the definition.
(I've seen this in other clues)
'speech lacking nothing' is the wordplay.
'speech' becomes 'oration' (oration is a kind of speech).
'lacking' suggests deleting specific letters.
'nothing' becomes 'O' (looks like zero - 0).
'oration' with 'o' removed is 'RATION'.
(Other definitions for ration that I've seen before include "Helping" , "One's allotted portion" , "Eke out" , "Apportion" , "Share or allotment, of food say" .)