He deals with the customers in a very 'professional' way. = He is very 'professional' in dealing with the customers.
a golf/tennis 'professional' [=a skillful golf/tennis player whose job is to teach other people how to play]
I was impressed by the calm and 'professional' way she handled the crisis.
(..) I'm-- I'm so sorry. Um, here you go. Thank you for your honesty. Oh, and, uh, please give this to your car wash professional. Have an A- day. God. - Hey. - Hi. - What's going on? (..)2013 TvShow: Breaking Bad Title: Confessions Season: 5 Episode 11
(..) In case I say no? Come on. Just tell me you need this. Your change. And if you'll hand this to your car wash professional, and have an A- day. Skyler? Skyler, I've got my chemo in about minutes. Can you take over (..)2013 TvShow: Breaking Bad Title: Confessions Season: 5 Episode 11