In forest eat out as preview? (9)

I believe the answer is:

foretaste

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

'preview?' is the definition.
(I've seen this before)

'in forest eat out' is the wordplay.
'forest eat' anagrams to 'FORETASTE'.
But, I'm not sure how this is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for foretaste that I've seen before include "Sampler" , "Anticipation" , "Anticipatory experience" , "Brief experience of what is to come" , "trailer" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app