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Make possible by sound, losing tempo (6)

Ross

I believe the answer is:

enable

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'make possible' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for enable that I've seen before include "Make possible, give the means to do something" , "Capacitate" , "Allow" , "Empower" , "Permit or facilitate" .)

I've seen this clue in The Hindu.
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