The sea hawk’s exclamation (3)

I believe the answer is:

aha

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'exclamation' is the definition.
(I have seen 'Exclamation of discovery ' mean 'aha' so perhaps 'exclamation' could also mean 'aha')

'the sea hawk's' is the wordplay.
'AHA' is hidden in amongst the letters.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for aha that I've seen before include "I've got it!" , "I see!" , "I'm surprised" , "Cry of surprise" , "I get it!" .)

I've seen this clue in the Evening Standard.

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