Crossword Genius

Stable chaps but apparently irritable ones (9)

Ross

I think it could be either:

liveryman

liverymen
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'stable chaps but apparently' is the definition.
I can't judge whether this definition defines the answer.

'irritable ones' is the wordplay.
'irritable' becomes 'livery' (livery can mean irritable due to a liver problem).
'ones' becomes 'man' (I can't justify this - if you can you should give a lot more credence to this answer).
'livery'+'man'='LIVERYMAN'

Can you help me to learn more?

(Other definitions for liveryman that I've seen before include "Member of a City Company" , "Member of guild" , "Uniformed servant" , "One looking after hacks" .)

I've seen this clue in The Globe and Mail.
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