Beware large hole in the ground (4)
I believe the answer is:
cave
This could be a double definition.
'beware large' is the first definition.
'cave' can be an answer for 'beware' (old-fashioned word meaning 'beware'). I'm not sure about the 'large' bit.
'hole in the ground' is the second definition.
(I've seen this in another clue)
Can you help me to learn more?
(Other definitions for cave that I've seen before include "Hollow - warning" , "Natural hollow in side of hill or cliff" , "Hollow in a rock" , "Warning - grotto" , "Subject of speleology" .)