7 down
Stock
bar
with
drink
–
1/3
off
(5)
Stock bar with drink – 1/3 off (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Stock is your definition here, meaning commonplace or trite. For the wordplay, take BAN (to bar something) and stick it in front of ALE (a drink), but that "1/3 off" bit means you knock one third of ALE's three letters off the end, leaving just AL – giving you BAN plus AL.