Play main piece, not initially audible (4,4)

I believe the answer is:

king lear

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

'play' is the definition.
(Shakespeare play)

'main piece not initially audible' is the wordplay.
'main piece' becomes 'king' (king is a kind of piece. I am not sure about the 'main' bit.).
'not initially' means to remove the first letter.
'audible' becomes 'clear' (I've seen this in another clue).
'clear' with its initial letter taken off is 'lear'.
'king'+'lear'='KING LEAR'

Can you help me to learn more?

(Other definitions for king lear that I've seen before include "Tragic hero" , "Shakespearian royal tragedy" , "Part of ruler" , "One of Shakespeare's tragedies" , "drama" .)

I've seen this clue in The Guardian.

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