Some begging for a drink (3)
I believe the answer is:
gin
'a drink' is the definition.
(gin is a kind of drink)
'some begging for' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'GIN' can be found hidden inside 'begging for'.
(Other definitions for gin that I've seen before include "Trap for snaring small mammals" , "Alcoholic drink once known as mother's ruin" , "It could be used for drinking" , "Colourless spirit flavoured with juniper berries - mother's ruin" , "Trap; mother's ruin" .)