Powdered seed tablets — first couple taken last — one must swallow (8)
I believe the answer is:
allspice
'swallow' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for allspice that I've seen before include "Aromatic West Indian tree" , "fragrant plant" , "Dried aromatic fruit from the West Indies" , "Pimento or Jamaica pepper" , "Aromatic dried fruit of a Caribbean tree" .)