Crossword Genius

A hundred security devices -- tickers? (6)

Ross

I believe the answer is:

clocks

'tickers?' is the definition.
(things which tick)

'a hundred security devices' is the wordplay.
'a hundred' becomes 'c' (roman numeral).
'security devices' becomes 'locks'.
'c'+'locks'='CLOCKS'

(Other definitions for clocks that I've seen before include "Timers" , "Notices" , "Timepieces" .)

I've seen this clue in The Telegraph.
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