Succulent drink gets round in (4)
I believe the answer is:
aloe
'succulent' is the definition.
(aloe is a kind of succulent)
'drink gets round in' is the wordplay.
'drink' becomes 'ale' (type of beer).
'gets round' becomes 'o' (I've seen this in other clues).
'in' means one lot of letters goes inside another.
'ale' going around 'o' is 'ALOE'.
(Other definitions for aloe that I've seen before include ". . . . vera, soothing plant" , "Succulent plant (may be bitter!)" , "Succulent plant (4) 5532" , "Fleshy-leaved plant" , "Plant source of purgative drug" .)