21 across
Wind
has
no
singular
source
from
which
it
comes
(3)
Wind has no singular source from which it comes (3)
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The definition is at the end of the clue.
How the clue works
Here source from which it comes is the definition, since wind (as flatulence) comes from the gut. The wordplay takes GUST (a wind) and removes the S, since S is the abbreviation for singular and the clue says it has 'no singular', leaving GUT.