Not included (6)
I believe the answer is:
exempt
'not included' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for exempt that I've seen before include "Permitted to be unaffected" , "Not subject to, taxation perhaps" , "free from tax, say" , "Free from, eg, tax" , "Not subject to, taxation say" .)