Cryptic.
16a. Latin girl; hot stuff. (4) - - - a
17d. In agreement, make up (5) - - o - e
Easy.
1a. Second-hand market (3,4,4,) - a - - - - - s - - -
9a. Badly organised (4-9) - - c - - - - - n - - - d
12a. David ______ wheelchair athlete (4) - - - -
14a Official decree (5) - d - l -
3d. ability to float (8) - - - - a- - -
4d. Difficult experience (6) - - - - a -
6d.Characters inscri8bed (9) - - - - - - i - g
7d. Old smelling (5) - - - t -
Help ! Pretty desperate