22 across : Even links in chain get removed in prison
3 letters --N
This type of clue has been cropping up a lot recently. So when I see even I look at the letter that corresponds with even numbers 2,4,6. When I see odd I look at 1,3,5 etc.
Even is not meant to be like odd or even. It describes a sequence of removal and you look at chain and remove letters sequentially. Very bad explanation . A can is a prison so start with c and remove every other letter in this case until you have three letters left.