Doesn't allow sections to be played (4)

I believe the answer is:

bars

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'doesn't' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bars that I've seen before include "Drinking establishments" , "Obstacles" , "Prohibits; pubs" , "Rods or drink dispensers" , "See 4" .)

I've seen this clue in The Globe and Mail.

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