Lea blabs about the sport (8)
I believe the answer is:
baseball
'lea blabs about the sport' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for baseball that I've seen before include "American game like rounders" , "US game" , "Nine-a-side game" , "Slab able to be used in the game?" , "Game played in sable alb?" .)