Totally defaced prickly shrub (5)
I believe the answer is:
holly
'prickly shrub' is the definition.
(I've seen this before)
'totally defaced' is the wordplay.
'totally' becomes 'wholly' (I've seen this before).
'defaced' means to remove the first letter (the word with its face removed).
'wholly' with its initial letter removed is 'HOLLY'.
(Other definitions for holly that I've seen before include "It has red berries and glossy leaves with prickles" , "Evergreen used in wreaths" , "Prickly tree" , "Shrub with red berries" , "Tree with red berries" .)