‘Round cut’ - unusual name for a plant (8)
I believe the answer is:
cyclamen
'a plant' is the definition.
The answer is an example.
'round cut unusual name' is the wordplay.
'round' becomes 'cycle' ('cycle' can be a synonym of 'round').
'cut' means to remove the last letter.
'unusual name' becomes 'amen' (I can't justify this - if you can you should believe this answer much more).
'cycle' with its last letter removed is 'cycl'.
'cycl'+'amen'='CYCLAMEN'
'for' is the link.
(Other definitions for cyclamen that I've seen before include "Popular house plant of the primrose family" , "Plant with nodding flowers" , "House plant with backward turned petals" , "Garden flower" , "Common house/garden plant" .)