Checks run by a famous scientist discarding tellurium (5,2)
I believe the answer is:
reins in
'checks' is the definition.
(check can mean to control or rein in)
'run by a famous scientist discarding tellurium' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'by' is a charade indicator (letters next to each other).
'a famous scientist' becomes 'einstein' (I've seen this before).
'discarding' is a deletion indicator.
'tellurium' becomes 'Te' (Te is the chemical symbol for tellurium).
'einstein' with 'te' taken away is 'einsin'.
'r'+'einsin'='REINS IN'
(Another definition for reins in that I've seen is " Checks".)