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Emergency set-up, product that sells quickly (7)

Ross

I believe the answer is:

hotline

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'emergency set-up' is the definition.

I can't explain the rest of the clue.

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(Other definitions for hotline that I've seen before include "Emergency blower" , "Direct phone link" , "Direct telephone link between two officials" , "Important number to call" , "Former direct phone line between the White House and the Kremlin" .)

I've seen this clue in The Telegraph.
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