Crossword Genius

Greek character assesses joint for Jack Sparrow’s vessel, say (6,4)

Ross

I believe the answer is:

pirate ship

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'jack sparrow's vessel say' is the definition.
I can't tell whether this definition defines the answer.

'greek character assesses joint' is the wordplay.
'greek character' becomes 'pi' (letter from the Greek alphabet).
'assesses' becomes 'rates' (rating is a kind of assessing).
'joint' becomes 'hip joint' (part of body).
'pi'+'rates'+'hip'='PIRATE SHIP'

'for' acts as a link.

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I've seen this clue in The Times.
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