Supervise bowling spells by Europeans (7)
I believe the answer is:
oversee
'supervise' is the definition.
(I know that supervise can be written as oversee)
'bowling spells by europeans' is the wordplay.
'bowling spells' becomes 'overs' (I've seen this before).
'by' says to put letters next to each other.
'europeans' becomes 'ee' (an abbreviation for European written twice).
'overs'+'ee'='OVERSEE'
(Other definitions for oversee that I've seen before include "As supervisor does" , "Superintend, manage" , "guide" , "survey" , "Supervise, monitor" .)