Hurries, seeing evidence of unhappiness (5)
I believe the answer is:
tears
I believe this clue is a double definition.
'hurries' is the first definition.
(tear is a kind of hurry)
'evidence of unhappiness' is the second definition.
'seeing' is the link.
(Other definitions for tears that I've seen before include "Rips; drops" , "Signs of unhappiness" , "Rush special" , "Moves very quickly" , "Lacerations (before bedtime?)" .)