Thumbs-up votes (4)
I believe the answer is:
ayes
'thumbs-up votes' 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 "Sounds of agreement" , "Votes in favour" , "Affirmatives at sea" , "Votes of approval during 5 Down" , "They express assent" .)