Flash competes with Jack Nicholson eg (5,4)
I believe the answer is:
movie star
'nicholson eg' is the definition.
I can't judge whether this definition defines the answer.
'flash competes with jack' is the wordplay.
'flash' becomes 'mo' (both mean a very short period of time).
'competes' becomes 'vies' ('vie' can be a synonym of 'compete').
'with' means one lot of letters go next to another.
'jack' becomes 'tar' (both are informal terms for sailor).
'mo'+'vies'+'tar'='MOVIE-STAR'
Can you help me to learn more?
(Other definitions for movie star that I've seen before include "Hoping for an Oscar" , "Film idol" , "Big player" , "Cruise, perhaps" , "VIP on set" .)