Last one drining me mad --only 4 letters and I have 2 -- so can't be that difficult. The clue is "More than one such may come to your door with 30a and hang around there (4) " 30a is " That's him for christmas, by the sound of it (5) " and the answer is CAROL
Good point dogwalker - the letters are - A - T , but crosswordnut is so much cleverer than you , he got it without the letters !!
Seriously I had never heard of the term WAITS for carol-singers.
Thanks crosswordnut.