Rubbish a job listing (4)

I believe the answer is:

rota

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'job listing' is the definition.
'rota' can be an answer for 'listing' (rota is a kind of listing). I am not sure about the 'job' bit.

'rubbish a' is the wordplay.
'rubbish' becomes 'rot' (both can mean nonsense).
'rot'+'a'='ROTA'

Can you help me to learn more?

(Other definitions for rota that I've seen before include "Working times list" , "Work roster" , "List of people to do job in turns" , "Repetitious canon" , "Task list, roster" .)

I've seen this clue in The Guardian.

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