ソウ, くさ, くさ, ぐさ, そ, や
grass, weeds, herbs, pasture, write, draft
JLPT3 G1 S9 F967
As per 早# (rising sun) + 艸 grass/plant → the rising sun as seen through plant life → *grass(es)* and *plants* → *rough*; *low-grade* → (rough style of) *handwriting*; *draft*.
[Full Kanji Etymology List]