Aged nurse upset those with a bib (9)

I believe the answer is:

dungarees

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'those with a bib' is the definition.
I can't tell whether this definition defines the answer.

'aged nurse upset' is the wordplay.
'upset' indicates an anagram.
'aged'+'nurse'='agednurse'
'agednurse' is an anagram of 'DUNGAREES'.

Can you help me to learn more?

(Other definitions for dungarees that I've seen before include "garment" , "Overall" , "protection at work" , "overalls required" , "Work overalls" .)

I've seen this clue in The Guardian.

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