After some struggle - not to mention a self-induced error which held me up for some time - I'm now down to the last three which are proving obstinate.
36A - Soft wet earth contains tellurium (5)
M?T??
37D - Toy sheep that became famous (5)
??L??
&
48A - Cipher using number association (6)
?O?O??
As usual, grateful for any assistance.