Bet grunge irritated old bible maker (9)
I believe the answer is:
gutenberg
'old bible maker' is the definition.
The definition suggests a singular noun which matches the answer.
'bet grunge irritated' is the wordplay.
'irritated' indicates anagramming the letters (letters disturbed or irritated).
'bet'+'grunge'='betgrunge'
'betgrunge' is an anagram of 'GUTENBERG'.
Can you help me to learn more?
(Other definitions for gutenberg that I've seen before include "Publisher" , "Pioneer printer" , "German printer of a 15th century Bible" , "German printing pioneer" , "He invented movable-type printing" .)