Before golf, urge no drink (6)
I believe the answer is:
eggnog
'drink' is the definition.
(eggnog is a kind of drink)
'before golf urge no' is the wordplay.
'before' is a charade indicator (letters next to each other).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'urge' becomes 'egg' (I've seen this before).
'egg'+'no'='eggno'
'g' after 'eggno' is 'EGGNOG'.
(Other definitions for eggnog that I've seen before include "Xmas tipple" , "spirits in me?" , "Winter cocktail" , "Alcohol-based drink" , "Drink which includes hot beer" .)