Crossword Genius

At sea no rating is lacking in knowledge (8)

Ross

I believe the answer is:

ignorant

'lacking in knowledge' is the definition.
(I've seen this before)

'at sea no rating' is the wordplay.
'at sea' indicates anagramming the letters.
'no'+'rating'='norating'
'norating' anagrammed gives 'IGNORANT'.

'is' is the link.

(Other definitions for ignorant that I've seen before include "Unaware, uninformed" , "Illiterate - unaware" , "Unlearned, lacking knowledge" , "Lacking knowledge or lacking manners" , "Lacking knowledge or awareness" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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