Cryptic crossword clue
Made invalid fill in due forms 9

The most common and most likely answer to this crossword clue is the 9 letter word NULLIFIED

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "Made invalid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made invalid = nullified.
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.

Crossword Answer definitions

NULLIFIED adjective
  1. That has been declared null
  2. Whose value has been set to null
NULLIFIED verb
  1. To make legally invalid.
  2. To prevent from happening.
  3. To make of no use or value; to cancel out.

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