Crude worker's penalty after touching manager's bottom (7)
I believe the answer is:
refiner
'crude worker's' is the definition.
(someone who refines crude oil)
'penalty after touching manager's bottom' is the wordplay.
'penalty' becomes 'fine' (a financial penalty).
'after' says to put letters next to each other.
'touching' becomes 're' (re can mean touching or regarding).
'bottom' suggests the final letters.
The last letter of 'manager' is 'r'.
'fine' after 're' is 'refine'.
'refine'+'r'='REFINER'
(Other definitions for refiner that I've seen before include "He clarifies" , "Oil worker" , "Oil processor" , "One who removes impurities (from metal)" , "Oilman" .)