Crossword Genius

In impeded light, playing game (3-2-3-6)

Ross

I believe the answer is:

pig-in-the-middle

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

But I can't explain it at all! Could you help me understand?

I've seen this clue in The Everyman puzzle in The Observer.
Want a hint initially instead of a full solution? Install my app