Hailed badly, upending a shrub (8)
I believe the answer is:
camellia
'shrub' is the definition.
(camellia is a kind of shrub)
'hailed badly upending a' is the wordplay.
'hailed' becomes 'came' (I've seen this in another clue).
'badly' becomes 'ill' ('ill' can be adverbial as in 'ill-advised').
'upending' is a reversal indicator.
'ill' written backwards gives 'lli'.
'came'+'lli'+'a'='CAMELLIA'
(Other definitions for camellia that I've seen before include "Email Cal about the flowering shrub" , "Shrub with showy flowers" , "Flowering plant related to tea" , "Flowering shrub for Mal and Celia, oddly" , "Shrub related to tea plant" .)