The most common and most likely answer to this crossword clue is the 5 letter word BUMPH
I've seen this crossword clue in The Guardian
B
U
M
P
H
Buddy explains!

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 BUMPH mean?
BUMPH noun- Toilet paper.
- Useless papers; now especially official documents, standardized forms, sales and marketing print material, etc.