This is used for spraying aircraft (3)

I believe the answer is:

jet

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'aircraft' is the definition.
(jet is a kind of aircraft)

I can't explain the remainder of the clue.

(Other definitions for jet that I've seen before include "Hard black mineral or plane engine" , "Black aircraft?" , "Narrow spouting stream" , "A spring in ballet" , "Raven" .)

I've seen this clue in The Irish Independent.

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