Crossword Genius

Play in which King Lear goes mad and loses throne ultimately (4)

Ross

I believe the answer is:

lark

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'play' is the definition.
(larking is a kind of playing)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lark that I've seen before include "Flighty type" , "what one may get up to?" , "Jape; bird" , "Singing bird and piece of harmless mischief" , "Songbird - 3" .)

I've seen this clue in The Independent.
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