Cricket side: number over that -- twelve! (4)
I believe the answer is:
noon
'that twelve' is the definition.
(I've seen this before)
'cricket side number over' is the wordplay.
'cricket side' becomes 'on'.
'number' becomes 'no' (abbreviation).
'over' is a charade indicator (letters next to each other).
'on' after 'no' is 'NOON'.
(Other definitions for noon that I've seen before include "Twelve during daylight" , "A moment of time" , "See 8" , "when only mad dogs go out?" , "Twelve o'clock, midday" .)