15A Arouse interest and admiration (7) ( - T - - - T - )
16D Good way to describe a lad called William (6) ( - - S - - - ) The 1st letter of 16D = 4th letter of 15A
1D Area between two concentric circles (4) ( - - - S )
19D This type of bill is very large (5)
21A Treat in a way as to prevent all decay (8) (E - - - - - - - ) 3rd letter of 21A is the 2nd letter of 19D
not sure about these. 19 d board. As in billboard .with broad being very large and board an anagram of it (type of). 16d, could be justly. justly is a good way and Just William being the name of books by Richmal Crompton. May be too obscure.Hope it helps
Just got this Xword in North Yorkshire News.
15a - ATTRACT (means your answer to 14d is not ATHEIST but SCEPTIC instead)
16d - I think is RASCAL
1d - The definition is ANNULUS, which obviously will not fit. I don't think the last letter is S, but O or E, as 9a is either COGITATE or MEDITATE.
21a - PRESERVE
19d - Don't know, but is -E-T-, which could be HEFTY but is a bit obscure
Don