"Leg over" is "end away" (2,4)
I believe the answer is:
on side
'leg' is the definition.
(cricket term)
'over is end away' is the wordplay.
'over' becomes 'o' (cricket abbreviation).
'away' indicates an anagram (letters move away from their original places).
'is'+'end'='isend'
'isend' with letters rearranged gives 'nside'.
'o'+'nside'='ON-SIDE'
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