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"fastener" is also used as a crossword clue. If that's what you saw, the answer is often zip (3 letters).
Definitions
restraint that attaches to something or holds something in place
Word origin
From fasten + -er.
Used in a sentence
“The mechanic replaced the damaged fastener.”
“This type of fastener is resistant to corrosion.”
“metal fastener”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Device that secures”8 letters
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