Run in next rally (5)
I believe the answer is:
extra
'run' is the definition.
(cricket run)
'in next rally' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EXTRA' can be found hidden inside 'next rally'.
(Other definitions for extra that I've seen before include "Unnecessary" , "Bit actor in movie's crowd scenes" , "Possibly a bad ball" , "like one of the crowd" , "non-standard item" .)