Cryptic crossword clue
Worst type of underground heating? 8

The most common and most likely answer to this crossword clue is the 8 letter word HELLFIRE

I've seen this crossword clue in The Guardian
H
E
L
L
F
I
R
E

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does HELLFIRE mean?

HELLFIRE noun
  1. The fire of Hell.
  2. Fire produced by the Devil, or a similar supernatural creature connected to Hell.
  3. A fire that burns with unusual heat or ferocity.
HELLFIRE adjective
  1. Of or relating to a violent, apocalyptic and ultimate day of reckoning and judgment; usually characterizing a form of Christian preaching.

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