Crossword Genius

Note reciprocal of three eighths? (3)

Ross

I believe the answer is:

lah

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This clue might be a double definition.

'note' is the first definition.
(I've seen this before)

'reciprocal of three eighths?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

Can you help me to learn more?

(Other definitions for lah that I've seen before include "Sixth note of major musical scale" , "It comes between soh and te" , "Sixth tonic sol-fa note" .)

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