In the morning European follows good sport (4)
I believe the answer is:
game
'sport' is the definition.
(thesaurus)
'in the morning european follows good' is the wordplay.
'in the morning' becomes 'am'.
'european' becomes 'e' (abbreviation e.g. EU).
'follows' says to put letters next to each other.
'good' becomes 'g' (abbreviation).
'am'+'e'='ame'
'ame' put after 'g' is 'GAME'.
(Other definitions for game that I've seen before include "Hunted animals or birds" , "bet" , "Up for it; gamble" , "Animals hunted for food" , "contest?" .)