Disguised language (4)
I believe the answer is:
code
'disguised language' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for code that I've seen before include "Morse is a good example" , "It may be impossible to read" , "Cryptogram or set of standards" , "Ethical standards" , "Eg, Morse" .)