Baby's teething biscuit (4)

I believe the answer is:

rusk

'baby's teething biscuit' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for rusk that I've seen before include "Bread baked again until it is brown and hard" , "Capital of Malta" , "Small hard biscuit (for babies)" , "Baby's teething biscuit" , "mouthful for baby?" .)

I've seen this clue in The Guardian.

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