Coppers to arrive at address (6)
I believe the answer is:
preach
'address' is the definition.
(I've seen this before)
'coppers to arrive' is the wordplay.
'coppers' becomes 'p'.
'to arrive' becomes 'reach' (reaching is a kind of arriving).
'p'+'reach'='PREACH'
'at' acts as a link.
(Other definitions for preach that I've seen before include "''Practise what you . . . . . . ''" , "Evangelise" , "Give a religious address" , "Sermonise" , "Give, eg, a sermon" .)