Cryptic crossword clue
Most heartless site’s not flexible

The most common and most likely answer to this crossword clue is the 8 letter word STONIEST

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Most heartless" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most heartless = stoniest.
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 STONIEST mean?

STONIEST adjective
  1. As hard as stone.
  2. Containing or made up of stones.
  3. Of a person, lacking warmth and emotion.
  4. Of an action such as a look, showing no warmth of emotion.
  5. Short for stony broke: without any money.

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