Approve recording 50 in random sporting format (6,4)
I believe the answer is:
stroke play
'sporting format' is the definition.
(golf term)
'approve recording 50 in random' is the wordplay.
'approve recording' becomes 'okep' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'50' becomes 'l' (Roman numeral).
'in' means one lot of letters goes inside another.
'random' becomes 'stray' (as in stray thoughts).
'okep'+'l'='okepl'
'okepl' placed inside 'stray' is 'STROKE-PLAY'.
(Another definition for stroke play that I've seen is " one way to compete on course".)