Plant rotation for the most part -- so be it! (8)
I believe the answer is:
cyclamen
'plant' is the definition.
'rotation for the most part so be it' is the wordplay.
'rotation' becomes 'cycle' (I've seen this before).
'for the most part' means to remove the last letter.
'so be it' becomes 'amen' (I've seen this before).
'cycle' with its last letter removed is 'cycl'.
'cycl'+'amen'='CYCLAMEN'
(Other definitions for cyclamen that I've seen before include "Perennial" , "Common house plant" , "House plant with backward turned petals" , "Common house/garden plant" , "Popular house plant of the primrose family" .)