The worst possible holes? (4)
I believe the answer is:
pits
This clue might be a double definition.
'the worst' is the first definition.
(I've seen this in another clue)
'possible holes?' is the second definition.
'pits' can be an answer for 'holes?' (pit is a kind of hole). I am not certain of the 'possible' bit.
Can you help me to learn more?
(Other definitions for pits that I've seen before include "Deep holes in the ground" , "Mines" .)