Dismissed for being unavailable? (3)
I believe the answer is:
out
I believe this is a double definition.
'dismissed' is the first definition.
(dismissed in cricket)
'unavailable?' is the second definition.
(I've seen this in another clue)
'for being' is the link.
(Other definitions for out that I've seen before include "Not allowed - on strike" , "in the shops" , "SECOND PART OF 16" , "impossible" , "Old hat" .)