Crossword Genius

At sea draw black and red seaweed (12)

Ross

I believe the answer is:

bladderwrack

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

'at sea draw black and red' is the wordplay.
'at sea' indicates an anagram.
'and' means one lot of letters go next to another (I've seen this in other clues).
'draw'+'black'='drawblack'
'drawblack' put after 'red' is 'reddrawblack'.
'reddrawblack' anagrammed gives 'BLADDERWRACK'.

(Another definition for bladderwrack that I've seen is " Common brown seaweed".)

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