Outdistance ship at sea that's not taking Polish on board (15)

I believe the answer is:

unsophisticated

I'm a little stuck... Click here to teach me more about this clue!

'that's not taking polish on board' is the definition.
I can't tell whether this defines the answer.

'outdistance ship at sea' is the wordplay.
'at sea' indicates an anagram.
'outdistance'+'ship'='outdistanceship'
'outdistanceship' is an anagram of 'UNSOPHISTICATED'.

Can you help me to learn more?

(Other definitions for unsophisticated that I've seen before include "Lacking experience" , "Simple" , "green" , "crude" , "straightforward" .)

I've seen this clue in The Telegraph.

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