A young or inexperienced bishop, or a bishop of minor standing.
From 'bishop' plus the diminutive suffix '-ling' (meaning young or small), as seen in 'duckling,' 'sapling,' and 'underling.'
The '-ling' suffix often carries a tone of affection or slight condescension—'underling' isn't neutral, and 'bishopling' similarly suggests a young cleric still learning the role rather than a fully established authority.
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