Present participle of clue; the act of providing information, hints, or understanding to help someone figure something out.
From clue + -ing (the present participle suffix from Old English). Both 'clueing' and 'cluing' are accepted spellings in modern English.
The debate between 'clueing' and 'cluing' is a funny modern spelling conflict—when English adds -ing to words ending in 'e,' sometimes we drop the 'e' and sometimes we keep it, and there's no single rule, just custom and preference.
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