Pacific island with prison mostly in concrete (8). I have iran?cil.
I realise I've gone wrong somewhere. I had tranquil but the "c" I'm fairly sure is correct.
Good answer mattrom but the "a" is correct I think (from an anagram) pasta in new bags = pinatas. The second "i" is from make hygienic order about cuckoo = sanitize. I would be happy to be wrong on either of those.