Vocally attack solo occasionally with Queen (7)

I believe the answer is:

slander

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'vocally attack' is the definition.
'slander' can be an answer for 'attack' (thesaurus). I'm not sure about the 'vocally' bit.

'solo occasionally with queen' is the wordplay.
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
'with' becomes 'and'.
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
The alternate letters of 'solo' are 'sl'.
'sl'+'and'+'er'='SLANDER'

Can you help me to learn more?

(Other definitions for slander that I've seen before include "Damaging statements" , "Speak ill of" , "Calumny" , "Defame" , "Malicious speech" .)

I've seen this clue in The Telegraph.

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