Crossword Genius

Gunpowder in small batches? (9)

Ross

I believe the answer is:

piecemeal

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'gunpowder in' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for piecemeal that I've seen before include "A bit at a time" , "by degrees" , "Bit by bit; unsystematic" , "Gradually, little by little" , "step by step" .)

I've seen this clue in The Independent.
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