Very many backing a new deliveryperson (8)

I believe the answer is:

dairyman

I'm a little stuck... Click here to teach me more about this clue!

'deliveryperson' is the definition.
I can't tell whether this defines the answer.

'very many backing a new' is the wordplay.
'very many' becomes 'myriad' (I've seen this in another clue. I am not sure about the 'very' bit.).
'backing' says the letters should be written in reverse.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'myriad' written backwards gives 'dairym'.
'dairym'+'a'+'n'='DAIRYMAN'

Can you help me to learn more?

(Other definitions for dairyman that I've seen before include "Farmworker" , "milk vendor" , "Butter, cheese maker" , "Pinta provider" , "Chap working with milk" .)

I've seen this clue in The Independent.

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