Plant deal splashed outside new shop (8)
I believe the answer is:
asphodel
'plant' is the definition.
(type of flower)
'deal splashed outside new shop' is the wordplay.
'splashed' is an anagram indicator.
'outside' is an insertion indicator.
'new' indicates anagramming the letters.
'deal' is an anagram of 'adel'.
'shop' with letters rearranged gives 'spho'.
'adel' placed around 'spho' is 'ASPHODEL'.
(Other definitions for asphodel that I've seen before include "Shop deal (anag.)" , "Old shape (anag) - plant" , "Flower of lily family - old heaps (anag)" , "Elysian plant" , "Lily-like plant, the flower of death to ancient Greeks" .)