Cryptic crossword clue
Criminally, feed line extremes of bias can be justified by argument 10

The most common and most likely answer to this crossword clue is the 10 letter word DEFENSIBLE

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "can be justified by argument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can be justified by argument = defensible.
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 DEFENSIBLE mean?

DEFENSIBLE adjective
  1. (of an installation etc) capable of being defended against armed attack
  2. (of an argument etc) capable of being justified

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