Seen unhappily in tears, a complete state (8)
I believe the answer is:
ripeness
'a complete state' is the definition.
(state of completion)
'seen unhappily in tears' is the wordplay.
'unhappily' indicates anagramming the letters.
'in' is an insertion indicator.
'tears' becomes 'rips' (rip is a kind of tear**).
'seen' anagrammed gives 'enes'.
'enes' put within 'rips' is 'RIPENESS'.
(Other definitions for ripeness that I've seen before include "Maturity" , "Mature stage" , "Ready-to-eat stage" .)