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Cockney intellectual mentioned a feature on his boat? (7)

Ross

I believe the answer is:

eyebrow

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'cockney intellectual mentioned a feature on his boat?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'feature on his boat?' is the wordplay.
'feature' becomes 'brow' (brow is a kind of feature).
'on' says to put letters next to each other.
'his boat?' becomes 'eye' (I can't explain this - if you can you should believe this answer much more).
'brow' after 'eye' is 'EYEBROW'.

Can you help me to learn more?

(Other definitions for eyebrow that I've seen before include "It may be raised" , "hairpiece" , "raising this in disapproval?" , "surprisingly elevated" , "Penthouse, for example" .)

I've seen this clue in The Guardian.
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