Crossword Genius

Coil on sink is security measure (8)

Ross

I believe the answer is:

lockdown

'is security measure' is the definition.
(I've seen this before)

'coil on sink' is the wordplay.
'coil' becomes 'lock'.
'on' says to put letters next to each other (in a down clue, letters appear on others).
'sink' becomes 'down'.
'lock'+'down'='LOCKDOWN'

(Other definitions for lockdown that I've seen before include "Act of confining prisoners to their cells" , "Security measure in prison" .)

I've seen this clue in The Sun.
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