Mad yarn about hotel assistant (7)

I believe the answer is:

yardman

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'hotel assistant' is the definition.
The definition suggests a singular noun which matches the answer.

'mad yarn about' is the wordplay.
'about' is an anagram indicator.
'mad'+'yarn'='madyarn'
'madyarn' anagrammed gives 'YARDMAN'.

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(Another definition for yardman that I've seen is " Farm worker".)

I've seen this clue in the Sydney Morning Herald.

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