Assents asea
I believe the answer is:
ayes
'assents asea' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ayes that I've seen before include "Nautical positive responses" , "The yes-votes at committee meeting" , "Votes of approval during 5 Down" , "The yes votes at committee meeting" , "Sounds of agreement" .)