Dismissed when evenly robust (3)
I believe the answer is:
out
'dismissed' is the definition.
(I've seen this before)
'evenly robust' is the wordplay.
'evenly' indicates alternate letters (the letters in even-numbered positions).
The alternate letters of 'robust' are 'OUT'.
'when' is the link.
(Other definitions for out that I've seen before include "For example, caught" , "On strike - dismissed - unconsciousout" , "sleeping" , "not acceptable" , "Revealed; unconscious" .)