Hankir
Re 9A
The 5 in the clue refers to five (not to another clue)
You have the answer to 30D
Take the contents out of each of these two words and you have the same two-letter word for the chemical symbol of a well-known element
Because there are two of them the element is in the plural.
And if you are in these you will not be free.
I hope that this helps.