Suit for diggers? (6)
I believe the answer is:
spades
I believe this clue is a double definition.
'suit' is the first definition.
(playing card suit)
'for diggers?' is the second definition.
(I've seen this before)
(Other definitions for spades that I've seen before include "Card suits and shovels" , "Implements for a suit" , "They may turn up" , "Garden tools and card suit" , "dark suit" .)