Actor seen to replant garden shrub (11)
I believe the answer is:
cotoneaster
'garden shrub' is the definition.
'cotoneaster' can be an answer for 'shrub' (cotoneaster is a kind of shrub). I'm unsure of the 'garden' bit.
'actor seen to replant' is the wordplay.
'replant' indicates anagramming the letters (I've seen 'replanted' mean this (letters get placed or planted in new positions)).
'actor'+'seen'+'to'='actorseento'
'actorseento' is an anagram of 'COTONEASTER'.
Can you help me to learn more?
(Other definitions for cotoneaster that I've seen before include "Red-berried garden shrub" , "Shrub with red berries" , "Plant" .)