18 across
Confound
what
could
be
seen
as
negative?
(7)
Confound what could be seen as negative? (7)
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The definition is at the beginning of the clue.
How the clue works
Confound means to nonplus or bewilder, which is the definition. The wordplay reads NON plus PLUS, since something that is non-plus (not positive) could be seen as negative.