The most common and most likely answer to this crossword clue is the 11 letter word DISCLAIMERS
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Buddy explains!

The straight part
We know that "Rejections" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rejections = disclaimers.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 DISCLAIMERS mean?
DISCLAIMERS noun- One who disclaims, disowns, or renounces.
- A public disavowal, as of responsibility, pretensions, claims, opinions, etc.
- A denial, disavowal, or renunciation, as of a title, claim, interest, estate, or trust; relinquishment or waiver of an interest or estate.
- A disclosure of an interest, relationship, or the like.