Removed from bed, like a poisonous tree (4)
I believe the answer is:
upas
'a poisonous tree' is the definition.
(I've seen this in another clue)
'removed from bed like' is the wordplay.
'removed from bed' becomes 'up'.
'like' becomes 'as'.
'up'+'as'='UPAS'
(Other definitions for upas that I've seen before include "Sap used to poison arrows" , "A poisoner" , "Antiar tree of Java" , "Java tree providing arrow poison" , "Tree from Java with poisonous sap" .)