Crossword Genius

A rather rough sea, too (2,4)

Ross

I believe the answer is:

as well

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'too' is the definition.
(synonyms)

'a rather rough sea' is the wordplay.
'rather rough sea' becomes 'swell' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'swell'='AS WELL'

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(Other definitions for as well that I've seen before include "To boot" , "on top" , "Appropriate" , "A swell sort of addition" , "with equal effect" .)

I've seen this clue in the Evening Standard.
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