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' acts as a 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" .)