Serpent with odd hold around European plant (8)
I believe the answer is:
asphodel
'plant' is the definition.
(type of flower)
'serpent with odd hold around european' is the wordplay.
'serpent' becomes 'asp' (asp is a kind of serpent).
'with' says to put letters next to each other.
'odd' is an anagram indicator.
'around' means one lot of letters goes inside another.
'european' becomes 'E' (abbreviation e.g. EU).
'hold' with letters rearranged gives 'hodl'.
'hodl' going around 'e' is 'hodel'.
'asp'+'hodel'='ASPHODEL'
(Other definitions for asphodel that I've seen before include "blooms from Elysian fields" , "Lad hopes (anag) - flower" , "Flower of lily family - old heaps (anag)" , "Shop deal (anag.)" , "Old shape (anag) - plant" .)