Without pause (3-4)
'without pause' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for nonstop that I've seen before include "without a break" , "Uninterrupted" , "Constant" , "(Of a flight) direct" , "Never pausing" .)
(Other definitions for non-stop that I've seen before include "Going straight from A to B" , "Round-the-clock" , "continuously" , "Uninterrupted" , "Unceasing" .)