Plant's spike at unusual angle (9)
I believe the answer is:
eglantine
'plant's' is the definition.
The answer is an example.
'spike at unusual angle' is the wordplay.
'spike' becomes 'tine' (spike of a fork).
'at' means one lot of letters go next to another (I've seen this in other clues).
'unusual' is an anagram indicator.
'angle' anagrammed gives 'eglan'.
'tine' put after 'eglan' is 'EGLANTINE'.
(Other definitions for eglantine that I've seen before include "Wild rose, sweet briar" , "Sweetbriar, inelegant in a way" , "Milton's honeysuckle" , "Strangely inelegant scented plant" , "Sweet brier" .)