Guess small drinks bill (4)
I believe the answer is:
stab
'guess' is the definition.
(I've seen this in another clue)
'small drinks bill' is the wordplay.
I cannot quite see how this works, but
'small' could be 's' (abbreviation - e.g. clothes size) and 's' is found in the answer.
'bill' could be 'tab' (a tab is a bill at a bar) and 'tab' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stab that I've seen before include "Impale; attempt" , "Go" , "Injure with knife" , "Puncture" , "Rough guess; to knife" .)