Aren't we usually full of beans? (4)
I believe the answer is:
pods
'beans?' is the definition.
The definition and answer can be both plants as well as being plural nouns.
Maybe you can see a link between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pods that I've seen before include "Seed cases" , "From enclosed cabins" , "Groups of dolphins" , "some seals" , "schools of whales?" .)