List changed in the plant (7)
I believe the answer is:
thistle
'plant' is the definition.
(thistle is a kind of plant)
'list changed in the' is the wordplay.
'changed' indicates an anagram.
'in' indicates putting letters inside.
'list' is an anagram of 'istl'.
'istl' put into 'the' is 'THISTLE'.
(Other definitions for thistle that I've seen before include "symbol of Scotland" , "Prickly weed" , "Prickly plant, emblem of Scotland" , "The weed has prickly-edged leaves" , "Scottish plant emblem" .)