The most common and most likely answer to this crossword clue is the 9 letter word BIOETHICS
I've seen this crossword clue in The Guardian
B
I
O
E
T
H
I
C
S
Buddy explains!
The straight part
We know that "The dos and don’ts of cloning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the dos and don’ts of cloning = bioethics.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 BIOETHICS mean?
BIOETHICS noun- The branch of ethics that studies the implications of biological and biomedical advances.