Genius 115

[hankir]

This month's Genius is tough for me.
Instructions are complicated. But 30D is referred to in many of the clues.
Answer to 30D may help.
Hope someone can help me on how to parse 30D.

30D. Group of brass monkeys lacking vitality (4)

Thanks in advance.

[kayakamina]

Free (zing)

[hankir]

Thanks kayakamina

Would never have thought of freezing the b***s off a brass monkey in this context.
I will now struggle with the rest of the puzzle and may be back for more help.

[roslyn251254]

10 of the clues "go after" free

[hankir]

Thanks roslyn251254.

I got one. 4D.