Hello, my last clue to get 2d Temperature taken from worryingly volatile air sacs (7) I have A?V?O??. The last letter could be i if my 13a Sentence like that entered into computer accessory, ending in "bum" (6,4) is right, I have PRISON TERM. But I only get that from the 'Sentence' bit , I dont understand how it works with the rest of the clue. Bet this is really easy or I've gone horridly wrong somewhere! Any help would be great!