Cryptic crossword clue
Genuine stunner’s quite heartless

The most common and most likely answer to this crossword clue is the 6 letter word KOSHER

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

The straight part
We know that "Genuine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case genuine = kosher.
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 KOSHER mean?

KOSHER verb
  1. To kasher; to prepare (for example, meat) in conformity with the requirements of the Jewish law.
KOSHER adjective
  1. Fit for use or consumption, in accordance with Jewish law (especially relating to food).
  2. (by extension) In accordance with standards or usual practice.
KOSHER adverb
  1. In a kosher manner; in accordance with kashrut.

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