What does the cryptic crossword clue "Idea that’s impossible for one to get into (6)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Idea that’s impossible for one to get into (6)

Guardian Cryptic #29838 | 6 Down | 2025-10-29

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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

I in NOT ON

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