The flawless must come from VICE (without flaw = flawless) being removed from SERVICEABLE, as you and Roslyn so well explained.
But maybe you can explain for me 6d - presumably DETAINEE, which fits definition part of clue. I've worked out that odd letters in 'That isn't ever ...' give TAINEE, but where does the DE come from? And what's 'and added' in the clueing supposed to give us?