You're seeing just the function unsubscribe, go back to Membrane.Clock module for more information.
Link to this function

unsubscribe(clock, pid \\ self())

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unsubscribe(t(), subscriber :: pid()) :: :ok

Unsubscribes pid from receiving ratio_message_t/0 messages from the clock.

For unsubscription to take effect, unsubscribe/2 should be called the same amount of times as subscribe/2.