Height of talent learner's shown for piano (8)

I believe the answer is:

altitude

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'height' is the definition.
(synonyms)

I can't explain the remainder of the clue.

(Other definitions for altitude that I've seen before include "Height above the earth's surface" , "Height above sea level" , "Height above sea-level" , "Lofty position" , "high place" .)

I've seen this clue in The Times.

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