25 down
To
collapse
after
fellow’s
gone
is
not
common
(4)
To collapse after fellow’s gone is not common (4)
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The definition is at the end of the clue.
How the clue works
The definition is is not common, giving you the colloquial "ain't." Take FAINT (to collapse) and drop the F (fellow's gone) and you're left with what you need.