20 down
Force
once
applied
to
opening
in
sink
blockage
(6)
Force once applied to opening in sink blockage (6)
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The definition is at the end of the clue.
How the clue works
Look at blockage at the end — that's your definition, meaning a state of stoppage. STASI, the old East German secret police, gives you your "force once", and then you add S, the opening letter of sink, to get your answer.