Consumption, ingestion (6)
I believe the answer is:
eating
This clue is a double definition.
'consumption' is the first definition.
(I know that consumption is a type of consumption)
'ingestion' is the second definition.
(I know that eating is a type of ingestion)
(Other definitions for eating that I've seen before include "Putting away" , "at breakfast?" , "Having supper?" , "Consuming food" , "Ingestion" .)