Low fellow in the field of American sport (7)

I believe the answer is:

baseman

I'm a little stuck... Click here to teach me more about this clue!

'field of american sport' is the definition.
'baseman' can be an answer for 'sport' (thesaurus). I'm not certain of the 'field of american' bit.

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

'in the' is the link.

Can you help me to learn more?

(Other definitions for baseman that I've seen before include "One in the field" , "infielder" .)

I've seen this clue in the Evening Standard.

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