Crossword Genius

Zwieback (4)

Ross

I believe the answer is:

rusk

'zwieback' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for rusk that I've seen before include "Baby's dry biscuit" , "It's hard for babe to get teeth into" , "Bread baked again until it is brown and hard" , "Baby's teething biscuit" , "cake" .)

I've seen this clue in the Canadiana and the Newsday.
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