Antipodean archaeologist? (6)
I believe the answer is:
Here is my best explanation:
'antipodean archaeologist?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
This is all the clue.
(Other definitions for digger that I've seen before include "Informal Aussie with spade?", "Earth mover", "An Aussie; type of wasp", "Spade for colloquial Aussie", "Australian; gardener", "Familiar shovel-wielding Australian", "Informal Australian using spade?", "Australian - excavator", "Miner" and "site machine".)