Rabble drained particularly potent brew (7)
I believe the answer is:
scrumpy
'potent brew' is the definition.
(type of strong cider)
'rabble drained particularly' is the wordplay.
'rabble' becomes 'scrum' (both can mean a crowd).
'drained' means to remove the middle letters.
'particularly' with its centre taken out is 'py'.
'scrum'+'py'='SCRUMPY'
(Other definitions for scrumpy that I've seen before include "Rough strong cider" , "Strong drink" , "rough drink" , "alcohol" , "Strong or dry cider" .)