Anyhow, proves to the last to be profligate (9)
I believe the answer is:
overspend
'anyhow proves to the last to be profligate' is the definition.
I can't tell whether this definition defines the answer.
'anyhow proves to the last' is the wordplay.
'anyhow' is an anagram indicator.
'to the last' becomes 'end'.
'proves' anagrammed gives 'oversp'.
'oversp'+'end'='OVERSPEND'
Can you help me to learn more?
(Other definitions for overspend that I've seen before include "splurge" , "To exceed one's budget" , "Use too many resources" , "Buy too much" , "Use up too much money" .)