Struggles to get under one collection of invasive plants (5)
I believe the answer is:
ivies
'collection of invasive plants' is the definition.
The answer and definition can be both plants as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'struggles to get under one' is the wordplay.
'struggles' becomes 'vies' (to vie is to struggle or contend with).
'to get under' says to put letters next to each other (in a down clue, some letters go under others).
'one' becomes 'i' (Roman numeral).
'vies' after 'i' is 'IVIES'.
Can you help me to learn more?
(Other definitions for ivies that I've seen before include "Climbing plants with evergreen leaves" , "Vines with evergreen leaves" , "Climbers" .)