Supplies reportedly more disgusting diners regularly (9)
I believe the answer is:
groceries
'supplies' is the definition.
(food supplies)
'reportedly more disgusting diners regularly' is the wordplay.
'reportedly' shows a homophone (sound like).
'more disgusting' becomes 'grosser'.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'diners' are 'ies'.
'grosser' is a homophone of 'grocer'.
'grocer'+'ies'='GROCERIES'
(Other definitions for groceries that I've seen before include "Foodstuffs" , "Supplies" .)