Period for which the players are unconscious? (4,3)
I believe the answer is:
time out
'period' is the definition.
(time out is a kind of period)
'the players are unconscious?' is the wordplay.
'the players are' becomes 'time' (I am not sure about this - if you are sure you should believe this answer much more).
'unconscious?' becomes 'out' (similar in meaning).
'time'+'out'='TIME-OUT'
'for which' is the link.
Can you help me to learn more?
(Other definitions for time out that I've seen before include "magazine" , "Give up waiting" , "taken in sabbatical" , "Break" .)