22 down
Cake
maker
with
large
number
over
(5)
Cake maker with large number over (5)
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The definition is at the beginning of the clue.
How the clue works
Cake maker is what we're after — flour is the stuff cakes are made from. Take FOUR for the "number" and put L (the abbreviation for "large") inside it, so L sits within FOUR to give FLOUR.