Agree about departure's intricacy (10)
I believe the answer is:
complexity
'intricacy' is the definition.
(thesaurus)
'agree about departure's' is the wordplay.
'agree' becomes 'comply' (complying is a kind of agreeing**).
'about' indicates putting letters inside.
'departure' becomes 'exit' ('exit' can be a synonym of 'departure').
'comply' going around 'exit' is 'COMPLEXITY'.
(Other definitions for complexity that I've seen before include "It's far from straightforward" , "Intricacy" , "Involvement" , "elaborate" , "intricate quality" .)