傭 combines the person radical 亻 with 庸, which likely contributes the sound and carries a sense of common or ordinary, suggesting a person hired for ordinary labor.
Meaning mnemonic
A person 亻 beside 庸 (which looks like a roof over a tool 用) suggests a worker under a roof using tools — someone you hire and employ.
Reading mnemonic
For ヨウ, imagine a yo-yo trick performed by a hired entertainer: yo-yo -> ヨウ, and you employ the person to do the trick.
