Ale is repeatedly drunk in predominantly Polish region (7)
I believe the answer is:
silesia
'polish region' is the definition.
(I've seen this in another clue)
'ale is repeatedly drunk in' is the wordplay.
'repeatedly drunk' can mean two replacements for 'drunk'.
'drunk' is an anagram indicator.
'drunk' becomes 'si' (I can't explain this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'ale'+'is'='aleis'
'aleis' anagrammed gives 'lesia'.
'lesia' enclosing 'si' is 'SILESIA'.
'predominantly' acts as a link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for silesia that I've seen before include "part of Europe" , "Polish area" , "European region" , "Region of central Europe" , "Central European area" .)