Budget problem proves Ned wrong (9)
I believe the answer is:
overspend
'budget' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.
'problem proves ned wrong' is the wordplay.
'problem' indicates an anagram.
'wrong' is an anagram indicator.
'proves' anagrammed gives 'oversp'.
'ned' with letters rearranged gives 'end'.
'oversp'+'end'='OVERSPEND'
Can you help me to learn more?
(Other definitions for overspend that I've seen before include "Use up too much money" , "splurge" , "To exceed one's budget" , "Buy too much" , "To run into debt" .)