11 across
Department
head
in
charge
of
exclusive
sea
food
(5,4)
Department head in charge of exclusive sea food (5,4)
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The definition is at the end of the clue.
How the clue works
The definition is sea food — specifically a fine flat fish. You build the answer letter by letter: D is the head of Department, then OVER meaning in charge of, and finally SOLE meaning exclusive.