Not to be discussed out of respect to management (3-6)
I believe the answer is:
top-secret
'not to be discussed out' is the definition.
I can't judge whether this defines the answer.
'respect to management' is the wordplay.
'management' indicates an anagram.
'respect'+'to'='respectto'
'respectto' with letters rearranged gives 'TOP-SECRET'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for top-secret that I've seen before include "Highly restricted (information)" , "Of the highest security classification" , "Most confidential , not to be leaked on any account" , "Erect post (anag)" , "Highly classified" .)