Plant western doctor inserted in nose (8)
I believe the answer is:
snowdrop
'plant' is the definition.
(a snowdrop is a plant)
'western doctor inserted in nose' is the wordplay.
'western' becomes 'w'.
'doctor' becomes 'Dr' (abbreviation).
'inserted in' is an insertion indicator.
'nose' becomes 'snoop' (to snoop is to nose around).
'w'+'dr'='wdr'
'wdr' inserted inside 'snoop' is 'SNOWDROP'.
(Other definitions for snowdrop that I've seen before include "A blooming" , "Spring bloom" , "Late winter flower" , "Avalanche perhaps" , "Rows pond (anag)" .)