Finally men on street work uninterrupted (3-4)
I believe the answer is:
non-stop
'uninterrupted' is the definition.
(I've seen this before)
'finally men on street work' is the wordplay.
'finally' indicates one should take the final letters.
'street' becomes 'st' (abbreviation).
'work' becomes 'op' (abbreviation for opus).
The last letter of 'men' is 'n'.
'n'+'on'+'st'+'op'='NON-STOP'
(Other definitions for non-stop that I've seen before include "Unceasing" , "continuously" , "Round-the-clock" , "Going straight from A to B" , "Continuous" .)