His hoarders created a sauce (11)
I believe the answer is:
horseradish
'a sauce' is the definition.
(horseradish sauce is a kind of sauce)
'his hoarders created' is the wordplay.
'created' indicates anagramming the letters (I've seen 'create' mean this).
'his'+'hoarders'='hishoarders'
'hishoarders' is an anagram of 'HORSERADISH'.
(Other definitions for horseradish that I've seen before include "Sharp-tasting condiment" , "Source of sauce to go with beef" , "Saucy root vegetable?" , "type of sauce" , "Root used in sauce" .)