The most common and most likely answer to this crossword clue is the 4 letter word BUMF
B
U
M
F
More clues leading to the result BUMF
- Sponge filling initially bog standard stuff
- Poor father’s opening junk mail
- Paper initially backing up main files
- Dud leader in financial paper
- I’m not sure that boyfriend’s holding inane documents
- Wrong, female supplying superfluous documents
- Worthless American fellow generating junk mail?
- Can fellow produce official papers?
- Junk-mail Mike put in short beige container
- Cadge key documentation?
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 BUMF mean?
BUMF noun- Toilet paper.
- Useless papers; now especially official documents, standardized forms, sales and marketing print material, etc.