員 (Kanji for clerk)

員 is a SUFFIX - it goes after any word for shop, to mean "a person who works in such a shop." For example,

Onyomi

When you give your money to the clerk IN the store, she uses her mouth to say thanks .

店員(てんいん)	shop staff ★★★★★ 店 (shop) + 員 (clerk) = 店員 (shop staff)
全員(ぜんいん)	all members ★★★★☆ 全 (all) + 員 (clerk) = 全員 (all members) all the members of the group
駅員(えきいん)	train station staff. ★★★☆☆ 駅 (train station) + 員 (clerk) = 駅員 (train station staff. )
委員(いいん)	member of a committee. ★☆☆☆☆ 委 (member) + 員 (clerk) = 委員 (member of a committee.)