Nothing to retake abnormal plant (3-4)
I believe the answer is:
oak-tree
'plant' is the definition.
(I know that oak tree is a type of tree)
'nothing to retake abnormal' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'abnormal' indicates anagramming the letters.
'retake' with letters rearranged gives 'aktree'.
'o'+'aktree'='OAK-TREE'
(Other definitions for oak-tree that I've seen before include "Source of acorns" , "Matured acorn" , "Acorn plant" , "Tree of the genus Quercus" , "It grows mighty from an acorn" .)