Crossword Genius

I came back and consumed waste (8)

Ross

I believe the answer is:

emaciate

'waste' is the definition.
(I know that waste can be written as emaciate)

'i came back and consumed' is the wordplay.
'back' is a reversal indicator.
'and' says to put letters next to each other.
'consumed' becomes 'ate' (to eat is to consume food).
'i'+'came'='icame'
'icame' written backwards gives 'emaci'.
'emaci'+'ate'='EMACIATE'

(Other definitions for emaciate that I've seen before include "Waste away" , "Make extremely thin" , "get very thin" .)

I've seen this clue in The Guardian.
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