Crossword Genius

Metal prostheses set these off? (6)

Ross

I believe the answer is:

alarms

'set these off?' is the definition.
(alarms are set off)

'metal prostheses' is the wordplay.
'metal' becomes 'al' (chemical symbol for aluminium).
'prostheses' becomes 'arms' (prosthetic arms).
'al'+'arms'='ALARMS'

(Other definitions for alarms that I've seen before include "Danger signals" , "Frightens or alerts" , "Scares or startles" , "Disturbs" , "Clocks that wake sleepers" .)

I've seen this clue in The Guardian.
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