Site for battle is too fenny, unfortunately (8)

I believe the answer is:

fontenoy

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'site for battle' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'too fenny unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'too'+'fenny'='toofenny'
'toofenny' with letters rearranged gives 'FONTENOY'.

'is' is the link.

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I've seen this clue in The Times.

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