It beats vegetable seeds (5)
I believe the answer is:
pulse
I believe this is a triple definition!
'it beats' is the first definition.
(I've seen this before)
'vegetable' is the second definition.
(pulse is a kind of vegetable)
'seeds' is the third definition.
(I've seen this before)
(Other definitions for pulse that I've seen before include "Vegetable (taken by doctors?)" , "often sought medically?" , "regular bodily motion!" , "Heart beat - peas, beans etc" , "Heart-throb" .)