Cryptic crossword clue
They’re incendiary crusaders for truth, says Spooner 12

The most common and most likely answer to this crossword clue is the 12 letter word FIRELIGHTERS

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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 FIRELIGHTERS mean?

FIRELIGHTERS noun
  1. Small block of flammable substance, typically sawdust and wax combined, used to light fires.

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