The most common and most likely answer to this crossword clue is the 8 letter word FERRITES
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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 FERRITES mean?
FERRITES noun- The interstitial solid solution of carbon in body-centered cubic iron.
- Any of a class of metal oxides which show ferrimagnetism; used in transformers, inductors, antennas, recording heads, microwave devices, motors and loudspeakers.
- The anion FeO22-, and any of the salts (formally derived from the unknown ferrous acid) derived from it.