Cryptic crossword clue
50 per cent of unions delayed protest, not acting with others 12

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

I've seen this crossword clue in The Sunday Telegraph
U
N
I
L
A
T
E
R
A
L
L
Y


Buddy explains!

The straight part
We know that "not acting with others" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not acting with others = unilaterally.
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 UNILATERALLY mean?

UNILATERALLY adverb
  1. In a unilateral way.

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