淑
シュク, しと.やか, すく, とし, よし
graceful, gentle, pure
JLPT1 G7 S11 F1922
As per
叔
# (slender and pendent) +
水
water → gentle cascade, likened to water hanging from a cliff → *graceful* → *pure*; *good* (compare 良).
[Full Kanji Etymology List]