Speaking about content of pod (3)
I believe the answer is:
pea
'pod' is the definition.
(I know that pea is a type of legume)
'speaking about content' is the wordplay.
'content' indicates a hidden word (letters contained within the clue).
'PEA' is hidden within 'speaking about'.
'of' acts as a link.
(Other definitions for pea that I've seen before include "Leguminous plant" , "Ape this plant awkwardly" , "Annual climbing plant with edible seeds" , "Climbing plant; vegetable" , "It grows in 23 Down" .)