Curiously OTT about a medium hit by private record label (5,6)

I believe the answer is:

tamla motown

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'record label' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'curiously ott about a medium hit by private' is the wordplay.
'curiously' indicates an anagram.
'about' means one lot of letters goes inside another.
'medium' becomes 'm' (as in UK clothing sizes).
'hit by' becomes 'lam' (to 'lam' means to hit hard. I am not sure about the 'by' bit.).
'private' becomes 'own' (as in one's own or private belongings).
'ott' is an anagram of 'tot'.
'a'+'m'+'lam'='amlam'
'tot' going around 'amlam' is 'tamlamot'.
'tamlamot'+'own'='TAMLA MOTOWN'

Can you help me to learn more?

(Another definition for tamla motown that I've seen is " [RECORD LABEL]".)

I've seen this clue in The Telegraph.

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