Is this your crossword clue?
"closing" is also used as a crossword clue. If that's what you saw, the answer is often shutting (8 letters).
Definitions
a concluding action
Used in a sentence
“openings and closings of doors”
“the closing of a popular play”
“I'd like to add some closing words.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Final part”7 letters
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C______