The Crossword Centre Clue-Writing Competition

CCCWC January competition voters’ comments
 
Clue no. 49: Roger operates between two German Boolean operators beneath the surface

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A clue to UNDERGROUND.
5 comments refer to this clue (from 5 competitors, 0 others)

Here is the text

Comments on the clue
1.I don't get the surface? Does Boolean operator have a meaning beyond the mathematical one?
2.This only happens in crossword clues
3.It always used to be German joiners. What are Boolean operators in this context?
4.The wordplay is sound, but the surface lacks real meaning.
5.Surface is spoilt by those Booleans