* Fiscal rate good in margins, corrected during purchase (9)
I believe the answer is:
budgetary
'fiscal' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?
'rate good in margins corrected during purchase' is the wordplay.
I cannot really see how this works, but
an anagram of 'rate' is 'etar' which is present in the answer.
'good' could be 'g' (abbreviation) and 'g' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for budgetary that I've seen is " of financial planning".)