Satirist harbours plant (4)
I believe the answer is:
iris
'plant' is the definition.
'satirist harbours' is the wordplay.
'harbours' indicates the answer is hidden within the clue.
'IRIS' is hidden in the letters of 'satirist'.
(Other definitions for iris that I've seen before include "Rainbow-goddess" , "Pupil is at the centre of this" , "bit of mince pie" , "Camera diaphragm" , "Eye diaphragm" .)