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"spanner" is also used as a crossword clue. If that's what you saw, the answer is often wrench (6 letters).
Definitions
a hand tool that is used to hold or twist a nut or bolt
Word origin
From span + -er.
Used in a sentence
“Pass me that spanner, Jake; there's just one more bolt to screw in.”
“Tools don’t have judgment or ethics, and they might fail to push back on bad ideas or dangerous requests. “Your spanner’s never like, ‘This shouldn’t be built,’” she said, using a British term for wrench.”
“The groove in this toolholder is what the spanner grabs onto when you are changing the tool.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Nut-turning tool”7 letters
02“Wrench”7 letters
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