Hoarder's minute silver dish (6)
I believe the answer is:
magpie
'hoarder's' is the definition.
(synonyms)
'minute silver dish' is the wordplay.
'minute' becomes 'm' (abbreviation).
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'dish' becomes 'pie' (I've seen this before).
'm'+'ag'+'pie'='MAGPIE'
(Other definitions for magpie that I've seen before include "Black and white bird, known as thieving" , "winger" , "chatty bird" , "Ominous bird if seen alone" , "Black and white member of crow family" .)