Crossword Genius

Seaweed found by idiot aboard small boat in Greek legend (8)

Ross

I believe the answer is:

sargasso

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

'seaweed' is the definition.
(I've seen this before)

'idiot aboard small boat in greek legend' is the wordplay.
'idiot' becomes 'ass' (both can mean a stupid person).
'aboard' is an insertion indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'boat in greek legend' becomes 'argo' (I can't explain this - if you can you should believe this answer much more).
's'+'argo'='sargo'
'ass' placed into 'sargo' is 'SARGASSO'.

'found by' acts as a link.

Can you help me to learn more?

(Other definitions for sargasso that I've seen before include "Gas soars around the North Atlantic sea" , "Sea with much floating weed" , "Sea in the North Atlantic with no land borders" , "Atlantic sea surrounded by ocean currents" , "Mass of weed" .)

I've seen this clue in The Independent.
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