get a line on (someone/something) - to get special information that will help you find someone or do something.
She talked like she has a line on what it will take to win.
(redirected from have a line on)
have a line on (someone or something)
To have helpful information about how to find, contact, or reach someone or something. John says he's got a line on a guy who can fix the car for half the price.Sally has a line on a job opportunity in New York that you should look into after you move.