Everyone prepared to follow British sport (4,4)
I believe the answer is:
ball game
'sport' is the definition.
(ball game is a kind of sport)
'everyone prepared to follow british' is the wordplay.
'everyone' becomes 'all' (all people).
'prepared' becomes 'game' (I've seen this before).
'to follow' is a charade indicator (letters next to each other) (some letters go after or follow others).
'british' becomes 'b' (abbreviation e.g. in BBC).
'all'+'game'='allgame'
'allgame' after 'b' is 'BALL-GAME'.
(Other definitions for ball game that I've seen before include "soccer, for example" , "Eg, rugby, lacrosse" , "squash, perhaps?" , "Eg, tennis or rugby" , "Tennis or hurling, for example" .)