Cryptic crossword clue
They’re positive half of defensive works must be removed 7

The most common and most likely answer to this crossword clue is the 7 letter word CATIONS

I've seen this crossword clue in Independent
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The straight part
We know that "They’re positive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they’re positive = cations.
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 CATIONS mean?

CATIONS noun
  1. A positively charged ion, i.e. one that would be attracted to the cathode in electrolysis.

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