Understand an archaeological project? (3)
I believe the answer is:
dig
I believe this is a double definition.
'understand' is the first definition.
(digging is a kind of understanding)
'an archaeological project?' is the second definition.
(I've seen this in another clue)
(Other definitions for dig that I've seen before include "Understand" , "Site of an archeological exploration" , "A brief archaeological excavation" , "Delve" , "Briefly, an archaeological excavation" .)