Irishman drinks red liquid in church (9)
I believe the answer is:
cathedral
'church' is the definition.
(cathedral is a kind of church)
'irishman drinks red liquid' is the wordplay.
'irishman' becomes 'cathal' (I am not sure about this - if you are sure you should believe this answer much more).
'drinks' indicates putting letters inside (inserted letters are consumed or drunk).
'liquid' indicates an anagram.
'red' is an anagram of 'edr'.
'cathal' placed around 'edr' is 'CATHEDRAL'.
'in' is the link.
Can you help me to learn more?
(Other definitions for cathedral that I've seen before include "St Paul's or St Patrick's" , "dramatic murder location" , "Halted car, badly, at the important church" , "Bishop's seat" , "Carted Hal off to church" .)