New name given to one plant (7)
I believe the answer is:
anemone
'plant' is the definition.
(anemone is a kind of plant)
'new name given to one' is the wordplay.
'new' is an anagram indicator.
'given to' means one lot of letters go next to another.
'name' is an anagram of 'anem'.
'anem'+'one'='ANEMONE'
(Other definitions for anemone that I've seen before include "Bright flower or sea plant" , "Flower related to the buttercup" , "Flower; marine creature" , "Brightly coloured flower or tube-shaped sea creature" , "bloom" .)