Suit apt to show the dirt? (6)
I believe the answer is:
spades
'suit' is the definition.
(playing card suit)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for spades that I've seen before include "Card suit and sturdy shovels" , "Suit in pack of cards" , "dark suit" , "Shovels or playing cards" , "Does some groundwork" .)