Greek sailor's dry wit

I believe the answer is:

attic salt

'dry wit' is the definition.
(I've seen this before)

'greek sailor's' is the wordplay.
'greek' becomes 'attic' (Attic is an example).
'sailor' becomes 'salt' (salt is a kind of sailor).
'attic'+'salt'='ATTIC SALT'

(Another definition for attic salt that I've seen is " Dry wit".)

I've seen this clue in The Telegraph.

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