Crossword Genius

Suit for digging (5)

Ross

I believe the answer is:

spade

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

This clue could be a double definition.

'suit' is the first definition.
(playing card suit)

'digging' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for spade that I've seen before include "Tool; playing card" , "Small shovel" , "Black leaf-shaped symbol on playing card" , "10

I've seen this clue in the Sydney Morning Herald.
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