This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
謰 combines 言 (speech) with 連 (connect, take along), suggesting a connection to speech or talking. The exact historical development is uncertain.
The left side is 言 (words) and the right side is 連 (linked). Picture linked words flowing in a chain of chatter, though the actual meaning is unclear.
For レン, imagine a long chain of linked words (連) being spoken (言) in a rapid, flowing conversation: the chain links cue レン.