Squealer made good fieldsman (6-3)

I believe the answer is:

square-leg

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'fieldsman' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'squealer made good' is the wordplay.
'made' indicates an anagram.
'good' becomes 'g' (abbreviation).
'squealer' is an anagram of 'squarele'.
'squarele'+'g'='SQUARE-LEG'

Can you help me to learn more?

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

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