Perhaps Shell's about to get penalty, right? (7)
I believe the answer is:
refiner
'perhaps shell's' is the definition.
I can't judge whether this defines the answer.
'about to get penalty right?' is the wordplay.
'about to get' becomes 're' (I've seen this in other clues).
'penalty' becomes 'fine' (a financial penalty).
'right?' becomes 'r' (abbreviation).
're'+'fine'+'r'='REFINER'
Can you help me to learn more?
(Other definitions for refiner that I've seen before include "Oil processor" , "He clarifies" , "Oilman" , "Oil worker" , "One who removes impurities (from metal)" .)