The puzzle is to be sent by regular mail according to the instructions.
And now some help with the following, please:
ACROSS:
16 Indirect effort made by government official accepting sponsorship, for a start ( 5 ): A???E
31 Old Bob - youth leader at cleric's home ( 7 ):
D?????Y
36 Roofless homes with fencing items ( 5): ??R??
37 Leave hurriedly - swift? Almost ( 4 ): ???E
40 Tennis champion, English, on the green in France( 5 )
E????
Many thanks in advance!