Operate under promoted sailor - it's a quicker way to work (3,3)
I believe the answer is:
rat run
'a quicker way to work' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'operate under promoted sailor' is the wordplay.
'operate' becomes 'run' (running is a kind of operating).
'under' is a charade indicator (letters next to each other) (below, in a down clue).
'promoted' is a reversal indicator (going up, in a down clue).
'sailor' becomes 'tar' (slang term for a sailor).
'tar' backwards is 'rat'.
'run' put after 'rat' is 'RAT RUN'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for rat run that I've seen before include "'Busy side-road during rush hour (3,3)'" , "'Side-road used to dodge traffic (3,3)'" , "Backstreet heavily used by drivers" , "Busy rush hour side road" , "Heavily-used minor road" .)