23 across
Order
of
fish
provided
by
end
of
day
(6)
Order of fish provided by end of day (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Order, in the sense of putting things into a system. The wordplay builds it up piece by piece: COD gives you the fish, IF means "provided", and then Y is the last letter of "day" — the "end of day" the clue mentions.