Question Author
"Is, as it were" is indeed undeniably in the clue, but I don't see how "is, as it were" = is't.
However, thank you boxtops for your replies and your efforts to explain the clue, and now like you, I prefer the answer by Ouzel, which is that the clue cryptically builds up to simple LIS (List Is) which is clued by the words "as it were" that this is not actually the answer, but it is going to be re-reinterpreted, in this case as "SHORT LIST" (literally List short by one letter). Short list is of course candidates non-cryptically. Thank you Ouzell and thank you boxtops. I fear i may have to have my brain reconfigured before I can fully see clues this convoluted, but I now understand and regard my query as solved.