Fully drink little drink? That man with drinks drinks gallons (4,2,3,6)
I believe the answer is:
down to the ground
'fully' is the definition.
(down to the ground means completely or totally)
'drink little drink? that man with drinks drinks gallons' is the wordplay.
I cannot really see how this works, but
'drink' could be 'the' (I have seen 'French drink' mean 'the' so perhaps 'drink' could also mean 'the') and 'the' is located in the answer.
'drink?' could be 'down' (to down something can mean to drink it quickly) and 'down' is present in the answer.
'man' could be 'r' (abbreviation for rook, a chess piece or 'man') and 'r' is located in the answer.
'gallons' could be 'g' (abbreviation) and 'g' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for down to the ground that I've seen before include "Where rain goes" , "where a lift may be going" , "Absolutely!" , "Completely" , "it's the responsibility of the Oval, for example" .)