Plastic egret -- nice, should be animated (9)
I believe the answer is:
energetic
'animated' is the definition.
(thesaurus)
'plastic egret nice' is the wordplay.
'plastic' indicates anagramming the letters (plastic can mean easily moulded).
'egret'+'nice'='egretnice'
'egretnice' with letters rearranged gives 'ENERGETIC'.
'should be' acts as a link.
(Other definitions for energetic that I've seen before include "High-powered" , "Showing great activity" , "Involving great activity" , "Vigorous and dynamic" , "Lively, spirited" .)