That's the same monster plant (10)
I believe the answer is:
snapdragon
'plant' is the definition.
The answer is an example.
'that's the same monster' is the wordplay.
'that's the same' becomes 'snap' (as in the card game).
'monster' becomes 'dragon' (dragon is a kind of monster).
'snap'+'dragon'='SNAPDRAGON'
(Other definitions for snapdragon that I've seen before include "Perhaps Christmas entertainment" , "Kind of antirrhinum" , "Garden plant" , "The blossom" , "One blooming" .)