Failure in team is sacked (4)
I believe the answer is:
miss
'failure' is the definition.
(miss is a kind of failure)
'in team is sacked' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MISS' can be found hidden inside 'team is sacked'.
(Other definitions for miss that I've seen before include "Girl or unmarried woman" , "Lass" , "Musical set in Vietnam" , "Damsel" , "Young woman" .)