Edible pulse (3)
'edible pulse' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lentil that I've seen before include "High-protein pulse" , "A legume, its seed" , "Pulse for soup etc" , "Edible seed of bean plant" , "Lintel (anag.)" .)
(Other definitions for pea that I've seen before include "Leguminous seed" , "Common vegetable seed from pod" , "It grows in a pod" , "Cause of a princess's insomnia?" , "Edible green seed" .)