I just have 16a left which is obviously gismo because of the letters I have. The clue is "Without practice, operate device" (5). I get the device bit but can somebody please explain the rest of the clue.
Thanks factor30, bibblebub and kayakamina for the usual fast replies. I get it now - didn't think of the "without" meaning around. I hate it when I think I know the answer but can't work out why so thanks for putting me out of my misery again.