The most common and most likely answer to this crossword clue is the 13 letter word ANTI-ABORTION
I've seen this crossword clue in The Times
A
N
T
I
-
A
B
O
R
T
I
O
N
Buddy explains!
The straight part
We know that "this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this = anti-abortion.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 ANTI-ABORTION mean?
ANTI-ABORTION adjective- Opposed to the practice or legalization of abortion.