Charlie and his sister left Midge in the groove (9)

I believe the answer is:

cannelure

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

'charlie and his sister left midge' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'and' means one lot of letters go next to another.
'his sister' becomes 'lenna' (I can't justify this - if you can you should believe this answer much more).
'left' shows that the letters should be reversed in order.
'midge' becomes 'Ure' (music producer Midge Ure).
'lenna' back-to-front is 'annel'.
'c'+'annel'+'ure'='CANNELURE'

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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