Produces a secret arrangement (7)
I believe the answer is:
creates
'produces' is the definition.
(I've seen this in another clue)
'a secret arrangement' is the wordplay.
'arrangement' indicates an anagram.
'a'+'secret'='asecret'
'asecret' with letters rearranged gives 'CREATES'.
(Other definitions for creates that I've seen before include "Brings into existence" , "Produces" , "Complains" , "Generates" , "coins" .)