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