Plant arrived — car turned up for collection (8)
I believe the answer is:
camomile
'plant' is the definition.
(type of plant)
'arrived car turned up for collection' is the wordplay.
'arrived' becomes 'came' ('come' can be a synonym of 'arrive').
'car' becomes 'limo' (limo is a kind of car).
'turned up' says the letters should be written in reverse.
'for collection' is an insertion indicator (inserted letters are collected by others).
'limo' written backwards gives 'omil'.
'came' going around 'omil' is 'CAMOMILE'.
(Other definitions for camomile that I've seen before include "Medicinal herbal tea" , "infusion of tea ..." , "Sweet-smelling plant used to make medicine and lotion" , "Aromatic plant used in tea" , "Fragrant plant" .)