Confounded sea plane circled Land's End waterfront (9)

I believe the answer is:

esplanade

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

'confounded sea plane' is the definition.
'esplanade' can be an answer for 'plane' (thesaurus). I am unsure of the 'confounded sea' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for esplanade that I've seen before include "Level seashore walkway" , "Sea-front drive" , "Space for a stroll by the seaside" , "Walkway along the seashore" , "Open, level space for walks or drives" .)

I've seen this clue in the Sydney Morning Herald.

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