Crossword Genius

Thoroughly secure (4,2,6)

Ross

I believe the answer is:

safe as houses

'thoroughly secure' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for safe as houses that I've seen before include "Thoroughly secure" , "Not in the least dangerous" , "Not in the least at risk" .)

I've seen this clue in The Guardian.
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