Isle in Tchaikovsky etude (4)

I believe the answer is:

skye

'isle' is the definition.
(Scottish island)

'in tchaikovsky etude' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SKYE' is hidden within 'tchaikovsky etude'.

(Other definitions for skye that I've seen before include "Home of the Cuillin mountains" , "Scottish isle" , "part of Scotland" , "Island in a boat song about Flora MacDonald and Bonnie Prince Charlie" , "Inner Hebridean isle" .)

I've seen this clue in The Sun.

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