15 across
Dairy
product
finally
baffling
in
your
starter
for
ten
(6)
Dairy product finally baffling in your starter for ten (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Dairy product. Take your, insert the last letter of baffling (that's G — "finally baffling") to get YO-G-UR, then tack on the first letter of ten (T, your "starter for ten") and you've got YOGURT.