Lily pad torn for removal from London venue (6)
I believe the answer is:
allium
'lily' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Maybe you can see an association between them that I can't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for allium that I've seen before include "Plant of onion family" , "Bulbous plant" , "Plant of onion genus" , "Onion/garlic genus" .)