bathhouse charge; bath fee
Dated term for the fee paid to use a public bathhouse. Modern Japanese more commonly uses 入浴料 or 銭湯の料金.
In the old days, people paid a bathhouse charge to use the public bath.
Compound of 湯 (hot water, bath) and 銭 (money, coin). The reading ゆせん is a straightforward combination of the kun'yomi ゆ and on'yomi せん.