Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
lead-in is a noun meaning "the introductory section of a story". It carries 2 recorded senses.
the introductory section of a story
“it was an amusing lead-in to a very serious matter”
wire connecting an antenna to a receiver or a transmitter to a transmission line
Definitions, synonyms and semantic relations for lead-in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.