Low fellows in the field of American sport (7)

I believe the answer is:

basemen

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'the field of american sport' is the definition.
I can't judge whether this definition defines the answer.

'low fellows' is the wordplay.
'low' becomes 'base' (synonyms).
'fellows' becomes 'men' (fellow can mean a man).
'base'+'men'='BASEMEN'

'in' acts as a link.

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I've seen this clue in the Evening Standard.

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