Flipping layabout drinking whiskey in basins (5)
I believe the answer is:
bowls
'basins' is the definition.
('bowl' can be a synonym of 'basin')
'flipping layabout drinking whiskey' is the wordplay.
'flipping' says the letters should be written backwards.
'layabout' becomes 'slob' (I've seen this before).
'drinking' is an insertion indicator.
'whiskey' becomes 'w' (alpha bravo charlie delta ...).
'slob' placed around 'w' is 'slwob'.
'slwob' in reverse letter order is 'BOWLS'.
'in' acts as a link.
(Other definitions for bowls that I've seen before include "Lawn game" , "Kitchen vessels" , "Containers for fruit" , "Rolls smoothly along the ground" , "Game played on green" .)