Quite awful Los Angeles drink (7)
I believe the answer is:
tequila
'drink' is the definition.
(tequila is a kind of drink)
'quite awful los angeles' is the wordplay.
'awful' indicates anagramming the letters.
'los angeles' becomes 'la'.
'quite' anagrammed gives 'tequi'.
'tequi'+'la'='TEQUILA'
(Other definitions for tequila that I've seen before include "Equal it! (anag)" , "Mexican tipple" , "one in the slammer" , "Mexican liquor made from agave" , "Is there another drink to equal it?" .)