Mob heard getting stash of riches (5)
I believe the answer is:
hoard
'stash of riches' is the definition.
'hoard' can be an answer for 'stash' (synonyms). I'm unsure of the 'of riches' bit.
'mob heard' is the wordplay.
'mob' becomes 'horde' (horde can mean a mob or crowd of people).
'heard' shows a homophone (sound like).
'horde' is a homophone of 'HOARD'.
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for hoard that I've seen before include "Secret stash" , "Rhoda (anag.)" , "Stockpile" , "Cache" , "(Miser's) store" .)