Cryptic crossword clue
Processing of ferric oxide, ultimately more intense 7

The most common and most likely answer to this crossword clue is the 7 letter word FIERCER

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

Buddy explains!

The straight part
We know that "more intense" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more intense = fiercer.
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 FIERCER mean?

FIERCER adjective
  1. Exceedingly violent, severe, ferocious, cruel or savage.
  2. Resolute or strenuously active.
  3. Threatening in appearance or demeanor.
  4. (rural) Excellent, very good.
  5. Of exceptional quality, exhibiting boldness or chutzpah.

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