Spades, say, to be convenient (4)

I believe the answer is:

suit

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'spades say' is the definition.
(spades is an example of a card suit)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for suit that I've seen before include "fit" , "Quarter of a full deck" , "Hearts, maybe" , "Spades, perhaps" , "Formal attire" .)

I've seen this clue in The Mirror.

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