Crossword Genius

Bird laugh (4)

Ross

I believe the answer is:

lark

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

This clue might be a double definition.

'bird' is the first definition.
(lark is a kind of bird)

'laugh' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for lark that I've seen before include "Amusing escapade; bird" , "One gets up early" , "Foolish activity, songbird" , "High-flying songbird" , "bit of mischief" .)

I've seen this clue in The Guardian.
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