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 will earn less money i will have small house and car i will do anything for you by true heart i have always obeyed you how much your professional camera costs? Will it come by selling laptop? If you want more money than ask from me go enjoy your life is there any special reason? (..)2009 3 Idiots