Whereupon to see the back of the musical director? (6)

I believe the answer is:

podium

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'back of the musical director?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for podium that I've seen before include "'Rostrum, dais (6)'" , "Speaker's platform" , "'Dais, pulpit (6)'" , "Platform or pedestal" , "Platform for speaking from" .)

I've seen this clue in the Evening Standard.

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