Second showing about a single (5)
I believe the answer is:
rerun
'second showing' is the definition.
(I've seen this before)
'about a single' is the wordplay.
'about' becomes 're' (regarding).
'a single' becomes 'run' (cricket).
're'+'run'='RERUN'
(Other definitions for rerun that I've seen before include "Show (eg, film) again" , "Put on again" , "Show again on TV" , "Film or programme broadcast again" , "Extra showing" .)