Budget speech missing start? (6)
I believe the answer is:
ration
'budget' is the definition.
(I've seen this in other clues)
'speech missing start?' is the wordplay.
'speech' becomes 'oration' (oration is a kind of speech).
'missing start?' means to remove the first letter.
'oration' with its first letter removed is 'RATION'.
(Other definitions for ration that I've seen before include "Limit supply of (eg, food)" , "Helping" , "Eke out" , "Share of food, etc" , "Restricted share" .)