City has an unpleasant duty collecting silver (9)
I believe the answer is:
anchorage
'city' is the definition.
(Anchorage is an example)
'an unpleasant duty collecting silver' is the wordplay.
'unpleasant duty' becomes 'chore' (chore is a kind of duty. I am not sure about the 'unpleasant' bit.).
'collecting' means one lot of letters goes inside another.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'chore' going around 'ag' is 'chorage'.
'an'+'chorage'='ANCHORAGE'
'has' acts as a link.
Can you help me to learn more?
(Other definitions for anchorage that I've seen before include "recluse's cell?" , "Area suitable for ships to stop" , "Alaskan port" , "source of security" , "Roads" .)