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What a gorilla might do to show extravagant signs of grief? (4,4,6)

Ross

I believe the answer is:

beat ones breast

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

'gorilla might do to show extravagant signs of grief?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'what a' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for beat ones breast that I've seen is " show remorse".)

I've seen this clue in The Hindu.
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