What flows ethereally within harpsichords (5)

I believe the answer is:

ichor

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'what flows ethereally' is the definition.
I can't judge whether this definition defines the answer.

'within harpsichords' is the wordplay.
'within' indicates the answer is hidden within the clue.
'ICHOR' is hidden within 'harpsichords'.

Can you help me to learn more?

(Other definitions for ichor that I've seen before include "Blood of the ancient gods" , "Fluid in Greek gods' veins" , "oozy stuff" , "Choir (anag.); gods' life force" , "Superior blood" .)

I've seen this clue in The Hindu.

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