Bite into meal, with medium rather than large starter (5)

I believe the answer is:

munch

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

'bite' is the definition.
(I know that munch is a type of bite)

I can't explain the remainder of the clue.

(Other definitions for munch that I've seen before include "champ" , "Edvard -, Norwegian artist (The Scream)" , "Chew; Norwegian artist" , "Chomp" , "He depicted" .)

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

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