customer

mastery
UK /ˈkʌstəmə/ US /ˈkʌstəmɚ/noun

card 1 of 10 · context meaning

Which meaning of 'customer' best matches the usage in the sentence?

Pug could just see Slote's pale face under his fur hat. "I don't agree with you on that. He's a pretty tough customer, Hopkins."