A golfer is upset about start of previous game (8)
I believe the answer is:
leapfrog
'game' is the definition.
(leapfrog is a kind of game)
'a golfer is upset about start of previous' is the wordplay.
'is upset' indicates anagramming the letters.
'about' is an insertion indicator.
'start of' indicates taking the first letters.
The initial letter of 'previous' is 'p'.
'a'+'golfer'='agolfer'
'agolfer' anagrammed gives 'leafrog'.
'leafrog' going around 'p' is 'LEAPFROG'.
(Other definitions for leapfrog that I've seen before include "Jump over" , "Advance by jumps" , "Game in which players vault over each other" , "Playground game" , "Advance by jumping over the opposition" .)