Son with beer to stem representative's patter (5,4)

I believe the answer is:

sales talk

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'representative's patter' is the definition.
'sales talk' can be an answer for 'patter' (thesaurus). I am not sure about the 'representative's' bit.

'son with beer to stem' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'with' means one lot of letters go next to another.
'beer' becomes 'ale' (type of beer).
'to stem' becomes 'stalk' (synonyms).
's'+'ale'+'stalk'='SALES-TALK'

Can you help me to learn more?

(Other definitions for sales talk that I've seen before include "Persuasive material" , "Pitch" , "promotional activity" , "lure to customer" .)

I've seen this clue in the Sydney Morning Herald.

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