4 down
One
questioning
pussy
stopped
by
opening
of
catflap
(7)
One questioning pussy stopped by opening of catflap (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is one questioning — a doubter. Pussy here means full of pus, giving you SEPTIC, and that's 'stopped by' the opening letter of catflap, which is C — so C gets inserted into SEPTIC to give you S, C, EPTIC.