Cryptic crossword clue
Campaigner‘s initial boost when running 12

The most common and most likely answer to this crossword clue is the 12 letter word ABOLITIONIST

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Campaigner" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case campaigner = abolitionist.
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 ABOLITIONIST mean?

ABOLITIONIST noun
  1. A person who favors the abolition of any particular institution or practice.
  2. A person who favored or advocated the abolition of slavery.
ABOLITIONIST adjective
  1. In favor of the abolition of slavery.

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