The Crossword Centre Clue-Writing Competition

CCCWC August competition voters’ comments
 
Clue no. 21: It's mostly nitrogen and oxygen in the empty friendly pixy coalmine containing oxygen and nitrogen. That's a fact.

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A clue to FAIRY / POINT (Right & Left).
4 comments refer to this clue (from 4 competitors, 0 others)

Here is the text

Comments on the clue
1.Can't make any sense of this surface
2.The clever idea rather gets in the way the rest of the clue
3.I do not understand and that's a fact.
4.I've seen PhD theses shorter than this.