Heart drug obtained from foxgloves (9)
I believe the answer is:
digitalis
'heart drug' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for digitalis that I've seen before include "Cardiac stimulant prepared from 11" , "plant making this drug?" , "medicinal drug" , "Drug from foxgloves" , "Drug derived from foxglove leaves" .)