The specified chaconnes can be omitted in new arrangement (6)
I believe the answer is:
chosen
'the specified' is the definition.
I can't tell whether this defines the answer.
'chaconnes can be omitted in new arrangement' is the wordplay.
'be omitted in' indicates named letters should be taken away.
'new arrangement' indicates an anagram (I've seen this in other clues).
'chaconnes' with 'can' taken away is 'hcones'.
'hcones' anagrammed gives 'CHOSEN'.
Can you help me to learn more?
(Other definitions for chosen that I've seen before include "Selected - Japanese name for Korea" , "Selected, preferred" , "If you're one of these few, you're very privileged" , "part of Asia once" , "'''Many are called, but few are ...'' (Bible) (6)'" .)