Crossword Genius

Free guitarist? Being given one for nothing gets rude rejection (4-3)

Ross

I believe the answer is:

kiss-off

'rude rejection' is the definition.
(to kiss-off is to rudely reject or dismiss)

I cannot understand how the remainder of the clue works.

I've seen this clue in the Independent.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.