Black knight captures to counter (6)

I believe the answer is:

jetton

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'counter' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'black knight captures to' is the wordplay.
'black' becomes 'jet' (similar in meaning).
'knight' becomes 'N' (chess abbreviation).
'captures' is an insertion indicator.
'jet'+'n'='jetn'
'jetn' going around 'to' is 'JETTON'.

Can you help me to learn more?

I've seen this clue in The Independent.

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