Pea, bean or lentil (5)
I believe the answer is:
pulse
This clue is a double definition.
'pea' is the first definition.
(thesaurus)
'bean or lentil' is the second definition.
(I know that bean is a type of pulse)
(Other definitions for pulse that I've seen before include "A vital sign turning" , "It beats - peas and beans" , "Musical beat; edible seeds" , "Rhythmic beat" , "lentils etc" .)