Tots creep unsettlingly into something no one should know about (3,6)
I believe the answer is:
top secret
'about' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'tots creep unsettlingly into something no one should know' is the wordplay.
'tots creep' can be anagrammed to 'TOP-SECRET'.
Though, I am not sure how this is indicated.
Can you help me to learn more?
(Other definitions for top secret that I've seen before include "Known to very few" , "Like highly guarded information" , "Very private" , "As 007 mission" , "the knack of sleeping well?" .)