The most common and most likely answer to this crossword clue is the 5 letter word APRIL
I've seen this crossword clue in The Guardian
A
P
R
I
L
More clues leading to the result APRIL
- Trouble crossing Peru, oddly, some time in spring
- Sampled at intervals, hamper will do for several weeks
- Trouble acquiring voting system within a month
- A voting system one left for a month
- So-called cruellest month sees couple in trouble
- Worry about electoral system for thirty days
- Botanical outgrowth, soft inside, seen in late springtime
- Penny in old money chucked back by such a fool
- A quiet brookâs long lost part of spring
- Period of trouble keeping control of image
Buddy explains!

The straight part
We know that "such a fool" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case such a fool = april.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.