Cryptic crossword clue
Extremist, brutal, releasing new type of radiation  11

The most common and most likely answer to this crossword clue is the 11 letter word ULTRAVIOLET

U
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Buddy explains!

The straight part
We know that "type of radiation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of radiation = ultraviolet.
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 ULTRAVIOLET mean?

ULTRAVIOLET noun
  1. Ultraviolet colour.
ULTRAVIOLET adjective
  1. Of electromagnetic radiation beyond (higher in frequency than) light visible to the human eye; radiation with wavelengths from 380 nanometre - 10 nanometre

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