Knowing about some insectivorous plant (7)
I believe the answer is:
flytrap
'insectivorous plant' is the definition.
'knowing about some' is the wordplay.
'knowing' becomes 'fly'.
'about' says the letters should be written backwards.
'some' becomes 'part'.
'part' back-to-front is 'trap'.
'fly'+'trap'='FLYTRAP'
(Other definitions for flytrap that I've seen before include "Specialised plant" , "that'll take six-footers" , "Venus ...., carnivorous plant" .)