Sit back; takes to court on structural material of plant and animal (7)
I believe the answer is:
tissues
'structural material of plant and animal' is the definition.
I can't judge whether this definition defines the answer.
'sit back takes to court on' is the wordplay.
'back' is a reversal indicator.
'takes to court' becomes 'sues' ('sue' can be a synonym of 'take to court').
'on' is a charade indicator (letters next to each other).
'sit' backwards is 'tis'.
'tis'+'sues'='TISSUES'
Can you help me to learn more?
(Other definitions for tissues that I've seen before include "Paper handkerchiefs" , "Sheets of very thin paper" , "not to be sneezed at? Au contraire!" , "Paper hankies" , "Catchers, when suffering from cold" .)