A cry of "Ship ahoy!" (3)

I believe the answer is:

pah

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'a cry of ship ahoy' is the definition.
I can't judge whether this definition defines the answer.

'of ship ahoy' is the wordplay.
'of' indicates the answer is hidden within the clue.
'PAH' can be found hidden inside 'ship ahoy'.

Can you help me to learn more?

(Another definition for pah that I've seen is " Expression of disgust".)

I've seen this clue in the Evening Standard.

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