New on street, work continuously (3-4)
I believe the answer is:
non-stop
'continuously' is the definition.
(I've seen this before)
'new on street work' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'street' becomes 'st' (abbreviation).
'work' becomes 'op' (common abbreviation for 'opus').
'n'+'on'+'st'+'op'='NON-STOP'
(Other definitions for non-stop that I've seen before include "Unceasing" , "Ceaseless" , "continuously" , "Uninterrupted" , "Round-the-clock" .)