This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
諔 combines 言 (speech) with 叔, which likely contributes sound. The exact historical meaning is uncertain, and the character is rare in modern Japanese.
The left side is speech 言, and the right side 叔 looks like a hand picking something up. Picture words being carefully selected, but the overall meaning remains vague.
For シュク, imagine a shy cook whispering uncertain words: shy cook -> シュク, and the speech radical 言 hints at the spoken part.