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Last of the sauce opened unsuccessfully in a Bandon takeaway (8)

Ross

I believe the answer is:

evacuate

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'last of the sauce' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for evacuate that I've seen before include "flee" , "Clear (dangerous building)" , "Leave unpopulated" , "Move people from their homes" , "Get out of" .)

I've seen this clue in the Irish Times.
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