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Really struggling today.
17a crystalline tree like structure. 8 letters
?????I?E
13d lower the quality of 7 letters
?E???NE
11d unproductive people or things
4,4
P??? ???d Grateful for any help.

17a dendrite

11 dead wood?

13 degrade ?

If dead wood is right (and I think it is) what is11a the common people 5 letters which would now be
DE??S

demos

http://www.oxforddictionaries.com/definition/english/demos

Thanks everyone! Still struggling might be back later.