I forgot to mention a clue teasingly written about seed-case (7)
I believe the answer is:
capsule
'case' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for capsule that I've seen before include "Tablet" , "Pill in the form of a small rounded container" , "Rounded gelatinous container of medicine" , "Gelatin case (for medication)" , "Gelatine case for medicine" .)