Crossword Genius

Not for many to know with respect to changing (3-6)

Ross

I believe the answer is:

top-secret

'not for many to know' is the definition.

'with respect to changing' is the wordplay.
'with' is a charade indicator (letters next to each other).
'changing' indicates an anagram.
'respect' put next to 'to' is 'respectto'.
'respectto' is an anagram of 'TOP-SECRET'.

(Other definitions for top-secret that I've seen before include "Highly classified" , "Highly restricted (information)" , "Highest classified (information)" , "Extremely restricted (information)" , "Most confidential , not to be leaked on any account" .)

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