Crossword Genius

To be one’s deliverer is no job for a boy! (7)

Ross

I believe the answer is:

postman

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'to be one's deliverer is no' is the definition.
I can't tell whether this defines the answer.

'job for a boy' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'for' is a charade indicator (letters next to each other).
'a boy' becomes 'man' ().
'post'+'man'='POSTMAN'

Can you help me to learn more?

(Other definitions for postman that I've seen before include "Letter deliverer" , "TV's Pat, for instance" , "Male to deliver mail" , "No stamp needed, stangely, for this job" , "Male mail carrier" .)

I've seen this clue in the Evening Standard.
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