One in a suit used for gardening (5)

I believe the answer is:

spade

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'one in a suit' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for spade that I've seen before include "Jack or one of a dozen others" , "that has a cutting edge" , "a gardener's needs?" , "Fictional detective" , "Digging tool" .)

I've seen this clue in The Irish News.

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