Monarch once quivering, angry with English knight (6,5)

I believe the answer is:

virgin queen

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

'quivering angry with english knight' is the wordplay.
'angry with' is an anagram indicator.
'english' becomes 'E' (abbreviation).
'knight' becomes 'n' (chess abbreviation).
'quivering' mixed up with 'e' gives 'virginquee'.
'virginquee'+'n'='VIRGIN QUEEN'

'once' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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