Store Staff, Store Employee, Shop Employee, Clerk, Shop Assistant
Noun and の adjective
てんいん
昔、あの店員の弟に家庭教しのバイトで英語を教えていました。
I used to have a part time job where I taught English to the younger brother of that clerk.
あの店員さん、とってもお茶目だったね。
That shop employee was a real kidder, wasn't he?
えっと、レジの順番待ちの列に並んでいる時に、ある店員さんが「万引きです！捕まえて！」と叫ぶのが聞こえたので、彼を捕まえたんです。
Well, while standing in the checkout line I heard one of the salespeople yell, "Shoplifter! Grab him!" so I grabbed him.
The shop member is someone who is a "member" (aka employed by) the shop. This is the shop staff.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.