Crossword Genius

Eg consuming a tin? (6)

Ross

I believe the answer is:

eating

This clue might be a double definition.

'eg consuming' is the first definition.
(consuming is a kind of eating)

'a tin?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

(Other definitions for eating that I've seen before include "Taking in solid food" , "Putting away" , "Ingestion" , "Out to dinner?" , "at breakfast?" .)

I've seen this clue in The Times.
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