A flowering plant some pull up insanely (5)
I believe the answer is:
lupin
'a flowering plant' is the definition.
(I've seen this before)
'some pull up insanely' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'LUPIN' is hidden in the letters of 'pull up insanely'.
(Other definitions for lupin that I've seen before include "Fodder plant" , "Pea relative with tall spikes of flowers" , "Flower named from wolf" , "Pod-producing garden flower" , "Nobody's child" .)