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"combining" is also used as a crossword clue. If that's what you saw, the answer is often mixing (6 letters).
Definitions
the act of combining things to form a new whole
Used in a sentence
“these little combinings together, of friends, for objects in themselves extremely laudable, but which the law terms conspiracies”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Joins”9 letters
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