Bean shows sign of life (5)
I believe the answer is:
pulse
I believe this clue is a double definition.
'bean' is the first definition.
(I've seen this before)
'sign of life' is the second definition.
(a person's pulse)
'shows' is the link.
(Other definitions for pulse that I've seen before include "Rhythmic beat" , "Heart beat - peas, beans etc" , "Vitality" , "Vegetable (taken by doctors?)" , "Rhythmical throb of arteries" .)