Fringe benefit available in some industries? (2-7)

I believe the answer is:

by-product

I'm a little stuck... Click here to teach me more about this clue!

'fringe benefit' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for by-product that I've seen before include "Extra result" , "Unintended side-effect" , "Side effect" , "Secondary, sometimes unintended, result" , "Spin-off" .)

I've seen this clue in The Sun.

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.