Crossword Genius

See a security device with a timing mechanism (5)

Ross

I believe the answer is:

clock

I'm a little stuck... Click here to teach me more about this clue!

'a timing mechanism' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'see a security device' is the wordplay.
'see' becomes 'C' (the word for the letter, according to Chambers).
'a security device' becomes 'lock' (I've seen this before).
'c'+'lock'='CLOCK'

'with' is the link.

Can you help me to learn more?

(Other definitions for clock that I've seen before include "Watch" , "Hit" , "Striker" , "Timepiece" , "how to falsify car's mileage" .)

I've seen this clue in the Evening Standard.
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