Crossword Genius

The highest point left in a boat (8)

Ross

I believe the answer is:

pinnacle

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

This might be a double definition.

'the highest point' is the first definition.
(I've seen this before)

'left in a boat' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for pinnacle that I've seen before include "Acme" , "Height of success" , "The highest point, say of fame" , "Highest point (of fame or building)" , "The highest point, summit" .)

I've seen this clue in the Best For Puzzles.
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