Expert way to cover half of Olympics (8)
I believe the answer is:
polymath
'expert' is the definition.
(expert in many things)
'way to cover half of olympics' is the wordplay.
'way' becomes 'path' (synonyms).
'to cover' indicates putting letters inside.
'half of' suggests halving the letters.
'olympics' with half the letters taken is 'olym'.
'path' enclosing 'olym' is 'POLYMATH'.
(Other definitions for polymath that I've seen before include "Person with extensive knowledge" , "One learned" , "Person of wide knowledge" , "One high in intelligence" , "Person with knowledge of many subjects" .)