Musician's craft returning from Sinai Peninsula is smuggling (7)

I believe the answer is:

pianism

I'm a little stuck... Click here to teach me more about this clue!

'smuggling' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'musician's craft returning from sinai peninsula' is the wordplay.
'PIANISM' is hidden backwards within the letters.
However, I am unsure how this is indicated.

'is' is the link.

Can you help me to learn more?

(Another definition for pianism that I've seen is " Musical skill".)

I've seen this clue in The Independent.

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