Unidentified visitors touring large sort of plants (10)

I believe the answer is:
stranglers
'sort of plants' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'unidentified visitors touring large' is the wordplay.
I cannot really understand how this works, but
'large' could be 'l' (eg in clothes sizes) and 'l' is found within the answer.
'visitors' could be 'strangers' and 'strangers' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for stranglers that I've seen before include "They'll put the squeeze on" , "murderers!" .)
