Loire gin drunk by Faith (8)
I believe the answer is:
religion
'faith' is the definition.
(I know that faith can be written as religion)
'loire gin drunk' is the wordplay.
'drunk' is an anagram indicator.
'loire'+'gin'='loiregin'
'loiregin' anagrammed gives 'RELIGION'.
'by' acts as a link.
(Other definitions for religion that I've seen before include "Organised system of faith" , "System of belief or worship" , "Institution to express belief in a god" , "Particular system of belief" , "Belief - way of life of monks and nuns" .)