Old pressman's belly starts to grumble, needing beer supply (9)

I believe the answer is:

gutenberg

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'old pressman's belly starts to grumble needing beer supply' is the definition.
I can't tell whether this definition defines the answer.

'belly starts to grumble needing beer supply' is the wordplay.
'belly' becomes 'gut' (informal term for the stomach or gut).
'starts to' says to take the initial letters.
'supply' is an anagram indicator (in a supple way).
The initial letters of 'grumble needing' is 'gn'.
'gn'+'beer'='gnbeer'
'gnbeer' is an anagram of 'enberg'.
'gut'+'enberg'='GUTENBERG'

Can you help me to learn more?

(Other definitions for gutenberg that I've seen before include "Publisher" , "German printing pioneer" , "German printer of a 15th century Bible" , "Pioneer printer" , "He invented movable-type printing" .)

I've seen this clue in The Independent.

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