One way to get a rate reduction (4,4)
I believe the answer is:
slow down
'one way to get a rate reduction' is the definition.
I can't judge whether this definition defines the answer.
'way to get a rate reduction' is the wordplay.
'way' becomes 's' (Compass direction - South).
'to get' says to put letters next to each other.
'a rate reduction' becomes 'lowdown' (I can't justify this - if you can you should give a lot more credence to this answer).
's'+'lowdown'='SLOW-DOWN'
Can you help me to learn more?
(Other definitions for slow down that I've seen before include "Reduce speed" , "Lose velocity" , "take it more easy" , "relax" , "Don't go so fast" .)