5 down
Dorothy’s
largely
wrong
steer,
as
usual
(8)
Dorothy’s largely wrong steer, as usual (8)
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The definition is at the end of the clue.
How the clue works
Look at as usual at the end — that's your definition, meaning conventional. "Dorothy's largely" gives you DOROTH (Dorothy with its last letter lopped off), and then wrong signals an anagram of that, giving you ORTHOD. Finally, a steer is an OX, which you tack on to complete the whole thing.