The most common and most likely answer to this crossword clue is the 4 letter word FISC
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More clues leading to the result FISC
Buddy explains!

The straight part
We know that "Old purse" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old purse = fisc.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does FISC mean?
FISC noun- The public treasury of Rome.
- Any state treasury or exchequer.