Post delivered by householder? (5,4)
I believe the answer is:
snail mail
'post' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for snail mail that I've seen before include "The conventional postal service" , "Ordinary post" , "Modern jargon for letter post, mollusc-slow compared to electronic transport" , "Slow delivery" , "traditional post" .)