Old Italian sailor, one of five (7)

I believe the answer is:

tarquin

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'old italian' is the definition.
The definition suggests a singular noun which matches the answer.

'sailor one of five' is the wordplay.
'sailor' becomes 'tar' (slang term for a sailor).
'one of five' becomes 'quin' (I've seen this before).
'tar'+'quin'='TARQUIN'

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(Other definitions for tarquin that I've seen before include "Last Etruscan king of Rome, 534-510 BC" , "proud king" .)

I've seen this clue in the Sydney Morning Herald.

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