The most common and most likely answer to this crossword clue is the 6 letter word PLACET
P
L
A
C
E
T
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The straight part
We know that "approval" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case approval = placet.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 PLACET mean?
PLACET noun- A vote of assent, as of the governing body of a university, an ecclesiastical council, etc.
- The assent of the civil power to the promulgation of an ecclesiastical ordinance.
- Expression of assent to a vote in the governing body of a university, an ecclesiastical council, etc.