By getting a mug out of a hole (5)
I believe the answer is:
abyss
'a hole' is the definition.
(I have seen 'Deep hole ' mean 'abyss' so perhaps 'hole' could also mean 'abyss')
'by getting a mug' is the wordplay.
'getting' means one lot of letters go next to another.
'mug' becomes 'ss' (I can't explain this - if you can you should give a lot more credence to this answer).
'by' put after 'a' is 'aby'.
'aby'+'ss'='ABYSS'
'out of' is the link.
Can you help me to learn more?
(Other definitions for abyss that I've seen before include "Very large and deep chasm" , "Measureless chasm" , "Hell; hole" , "Deep hole, seems bottomless" , "Fathomless pit" .)