Still struggling. even after a few days away to recharge the batteries.
However, just to say I have Think Twice also.
I have two answers for Things that grow 7 & 12 (they fit but may not be correct!)
Still haven't got anagrams 9 & 18. With 9 I can get several capitals but then can't get two other towns. With 18 I feel sure it should be Jerusalem and Tel Aviv but then can't get third town!
Also still at a loss with Prefix etc for Leg, Mouth and ate.
And, of course, those two elusive books and authors!
If I get anywhere, I'll let you know.