Marketeers showing enthusiasm to drink beers (5,4)

I believe the answer is:

sales team

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'marketeers' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'enthusiasm to drink beers' is the wordplay.
'enthusiasm' becomes 'steam' (I've seen this before).
'to drink' means one lot of letters goes inside another.
'beers' becomes 'ales' (ale is a type of beer).
'steam' enclosing 'ales' is 'SALES TEAM'.

'showing' acts as a link.

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I've seen this clue in The Guardian.

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