The most common and most likely answer to this crossword clue is the 12 letter word DISCOTHEQUES
D
I
S
C
O
T
H
E
Q
U
E
S
Buddy explains!

The straight part
We know that "entertainment venues" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case entertainment venues = discotheques.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DISCOTHEQUES mean?
DISCOTHEQUES noun- (slightly obsolete) A nightclub where dancing takes place.