At basin, rough? Avoid booze! (7)
I believe the answer is:
abstain
'avoid booze' is the definition.
'abstain' can be an answer for 'avoid' (abstaining is a kind of avoiding). I am unsure of the 'booze' bit.
'at basin rough?' is the wordplay.
'rough?' is an anagram indicator (a rough or broken ordering of the letters).
'at'+'basin'='atbasin'
'atbasin' with letters rearranged gives 'ABSTAIN'.
Can you help me to learn more?
(Other definitions for abstain that I've seen before include "Give up smoking, say" , "Forego,do without" , "Stay neutral, in a way" , "Go without" , "Choose not to consume" .)