Stomach ill temper about British (5)
I believe the answer is:
bible
'stomach' is the definition.
(informal name for a part of a ruminant's stomach)
'ill temper about british' is the wordplay.
'ill temper' becomes 'bile' (I've seen this in another clue).
'about' indicates putting letters inside.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'bile' going around 'b' is 'BIBLE'.
(Other definitions for bible that I've seen before include "Holy Scripture" , "Holy books" , "Book of the Scriptures" , "Holy Writ" , "See 12" .)