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https://www.nytimes.com/crosswords/game/miniAnswer
The answer for the clue "Lead-in to lingo" is -
Answer: DUO
I am kind of wondering, what does the phrase "lead in to lingo" even mean. To be honest, I do not understand the relation between the clue and the answer.
Lead-in to Lingo could mean to introduce someone to something like a subject, game or language or anything. Whereas the word duo in this context could mean something similar to team play comprising 2 participants.
Now exactly how does the term lead-in to lingo mean "duo", even I can't fully understand. If you figure out, let me know in the comments below.
This particular clue appeared in the NYT - The Mini Crossword on August 27, 2023.
This particular clue indeed looks like a difficult to crack riddle all by itself.