Shrub completely pruned from above (5)

I believe the answer is:

holly

I'm a little stuck... Click here to teach me more about this clue!

'shrub' is the definition.
(I have seen 'Prickly shrub ' mean 'holly' so perhaps 'shrub' could also mean 'holly')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for holly that I've seen before include "Prickly-leaved shrub" , "Tree with prickles" , "Prickly tree" , "Prickly plant" , "Shrub with scarlet berries" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.