... so eat it as a snack (7)

I believe the answer is:

toastie

I'm a little stuck... Click here to teach me more about this clue!

'a snack' is the definition.
(a toasted snack)

'so eat it' is the wordplay.
'so eat it' can be anagrammed to 'TOASTIE'.
However, I'm not clear how this is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for toastie that I've seen before include "Type of sandwich" , "Grilled sandwich" , "Hot snack (informal)" , "this food's hot" , "Toasted sandwich" .)

I've seen this clue in The Hindu.

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