Related baking ingredient? (4)
I believe the answer is:
akin
'related' is the definition.
(similar in meaning)
'baking ingredient?' is the wordplay.
'ingredient?' says the answer is hidden in the clue (I've seen 'ingredient of' mean this).
'AKIN' is hidden within 'baking'.
(Other definitions for akin that I've seen before include "Related by blood" , "Of a similar nature" , "Similar, like" , "Seemingly related" , "Similar in quality" .)