grow like a plant (8)
I believe the answer is:
vegetate
'grow like a plant' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for vegetate that I've seen before include "Lead a dull and inactive life" , "Live a dull inactive life" , "appears to be inert" , "Do very little" , "Live uneventful life, stagnate" .)