The most common and most likely answer to this crossword clue is the 7 letter word STAPLER
I've seen this crossword clue in The Times
S
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P
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More clues leading to the result STAPLER
- Device for fastening paper, basic? Right
- Device used for fastening plaster cast
- Office equipment, basic, facing resistance
- Put power into not so new office equipment
- Joiner mixes plaster
- Office item even more out-of-date quietly installed
- Page is held by older office appliance
- Instrument is a small drum, used often in allegro
- Office gadget that is more essential?
- Page secured by older office appliance
Buddy explains!

The straight part
We know that "Device for fastening paper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case device for fastening paper = stapler.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 STAPLER mean?
STAPLER noun- A device which binds together sheets of paper by driving a thin metal staple through the sheets and simultaneously folding over the ends of the staple against the back surface of the paper.
- A dealer in staple goods.
- One employed to sort wool according to its staple.