Cryptic crossword clue
Part of educational foundation improperly agreed to alter mark 7

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

I've seen this crossword clue in The Guardian
R
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The straight part
We know that "to alter mark" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to alter mark = regrade.
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 REGRADE mean?

REGRADE verb
  1. To grade again, give a new grade or grading to.
  2. To regroup or reassign.
  3. To change the classification of (potentially secret documentation).
  4. To retire or recede.

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