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"On the double!" (6)

Ross

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4

6

'on the double' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for pronto that I've seen before include "Italian telephonic greeting" , "Quickly, promptly" , "Quickly (sl.)" , "Immediately, amigo" , "Right now, amigo" .)

I've seen this clue in the Newsday, the USA Today and The Washington Post.
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