Crossword Genius

Time construction worker set off (7)

Ross

I believe the answer is:

trigger

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'set off' is the definition.
(synonyms)

'time construction worker' is the wordplay.
'time construction' becomes 't' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'worker' becomes 'rigger' (rigger is a kind of worker).
't'+'rigger'='TRIGGER'

Can you help me to learn more?

(Other definitions for trigger that I've seen before include "Part of gun" , "make things happen" , "Roy Rogers' horse" , "Activating device" , "Pull it to discharge gun" .)

I've seen this clue in The Sun.
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