Crossword Genius

Bolt to impromptu industrial action? (9,6)

Ross

I believe the answer is:

lightning strike

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

'bolt to impromptu industrial' is the definition.
I know nothing about this answer so I can't judge whether this works.

'action?' is the wordplay.
I cannot quite understand how this works, but
'action?' could be 'strike' (strike is a kind of action) and 'strike' is present in the answer.
The remaining letters 'lightning' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lightning strike that I've seen before include "that a place only witnesses once?" , "not supposed to be repeated in one place" , "Spontaneous coming out" , "Type of industrial action" , "immediate action" .)

I've seen this clue in the Sydney Morning Herald.
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