@ aristo: (and anyone else interested, the full parse); I Ithought you, as an American, would definitely see
swell = ok, up => ko
Without (here the opposite of within) a container indicator
An/a are interchangeable and just coincidence an "n" follows in the answer being clued + organ * (anagrind: transplant)
Young Joey: definition
'll: link.
@ stevea: fine with me to leave it in. Similarly Seamus, I trust you'll see from the timings of our posts they were independently constructed.