Crossword Genius

Sacks carrying trade explosives (9)

Ross

I believe the answer is:

fireworks

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

'sacks carrying trade explosives' is the definition.
I can't judge whether this defines the answer.

'sacks carrying trade explosives' is the wordplay.
'sacks' becomes 'fires' ('fire' can be a synonym of 'sack').
'carrying' is an insertion indicator.
'trade explosives' becomes 'work' (I can't explain this - if you can you should believe this answer much more).
'fires' placed around 'work' is 'FIREWORKS'.

Can you help me to learn more?

(Other definitions for fireworks that I've seen before include "rockets, perhaps" , "Display on November 5th etc" , "Pyrotechnics" .)

I've seen this clue in The Guardian.
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