Upright fellows, our deliverers (7)

I believe the answer is:

postmen

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

'upright fellows' is the wordplay.
'upright' becomes 'post' (post is a kind of upright**).
'fellows' becomes 'men' (I've seen this before).
'post'+'men'='POSTMEN'

Can you help me to learn more?

(Other definitions for postmen that I've seen before include "Mail deliverers" , "They deliver mail" , "Male mail carriers" .)

I've seen this clue in the Evening Standard.

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