Champion! Finishing early to grab a drink (8)
I believe the answer is:
advocaat
'drink' is the definition.
(alcoholic drink)
'champion finishing early to grab a' is the wordplay.
'champion' becomes 'advocate' (advocate can mean to champion or support).
'finishing early' means to remove the last letter (the word finishes earlier than normal).
'to grab' is an insertion indicator.
'advocate' with its last letter removed is 'advocat'.
'advocat' going around 'a' is 'ADVOCAAT'.
(Other definitions for advocaat that I've seen before include "Liquer of eggs, sugar and brandy" , "Liqueur (for lawyers?)" , "Egg-based liqueur" , "Egg and rum drink" , "Liqueur containing raw eggs" .)