Writer cheers invigorating person with five notes (10)

I believe the answer is:

pentatonic

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'person with five notes' is the definition.
I can't judge whether this defines the answer.

'writer cheers invigorating' is the wordplay.
'writer' becomes 'pen' (something which writes).
'cheers' becomes 'ta' (both can informally mean thank you).
'invigorating' becomes 'tonic' (similar in meaning).
'pen'+'ta'+'tonic'='PENTATONIC'

Can you help me to learn more?

(Other definitions for pentatonic that I've seen before include "kind of scale" , "limited scale" .)

I've seen this clue in The Times.

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